aging · fitness · food · health · nutrition · Science

Why one new anti-aging supplement is great… if you’re a dolphin

One never knows what one’s media feed will present to one on any given day.

Last Monday morning, the following ad appeared:

Ad for Fatty 15 (TM), a bottle of pills claiming to improve  your health in miraculous ways.
Ad for Fatty 15 (TM), a bottle of pills claiming to improve your health in myriad and miraculous ways.

My first thoughts were:

  • Fatty15?
  • FATTY15?
  • Really?!
  • THAT’S the name the marketing team came up with in order to SELL this to me?
I am so very confused. Thanks Uday Mittai from Unsplash, for the perfect rendition of it.
I am so very confused. Thanks Uday Mittai from Unsplash, for the perfect rendition of it.

Okay, what in the wild and unregulated supplement world is this FATTY15 thing? Here’s the TLDR version.

  • There are a lot of fatty acids.
  • They are found in lots of foods we eat.
  • Omega-3 fatty acids are a good fatty acid. They’re found in e.g. salmon, walnuts and edamame.
  • Trans-fats are a bad fatty acid. They’re found in e.g. many ultra-processed and fried foods, and many baked goods.
  • C15:0 is a recently found fatty acid. We don’t know much about it.
  • A new company called FATTY15 (again, wtaf) wants to sell it to you, promising you whole health in a bottle.

BUT BUT… HOW DID THE DOLPHINS GET INVOLVED?

Patience– I’m getting to this now.

It turns out that some dolphins work for the US Navy. They detect underwater mines and enemy swimmers (don’t ask me how). Part of their employee health plan includes research on and treatment of diseases related to dolphin-aging (they get some of the same diseases we do).

This person below– Dr. Stephanie Venn-Watson, the translational medicine and research program director for the Navy’s National Marine Mammal Foundation– led a crack team of dolphin health experts to manage their care.

Honestly, if my job were to make sure that dolphins lived their best life ever while in the emply of the United State government, I'd look that happy, too.
Honestly, if my job were to make sure that dolphins lived their best lives ever while in the employ of the United States government, I’d look that happy, too.

Here’s some info from this article:

The team analyzed the dolphins’ blood samples taken throughout their lives to identify molecules present in the healthiest dolphins. One of the top nutrients was the molecule C15:0, a saturated fatty acid (pentadecanoic acid). In the human diet, C15:0 is present in dairy fat—whole milk, butter, and cheeses.

Obviously, dolphins don’t have that option after infancy, unlike humans. But don’t worry– your research dollars found a solution:

when they fed [older] dolphins with chronic diseases diets higher in C15:0 (fatty fish), they became healthier. Further research supported their findings that C15:0 lowers risk and can actually reverse many chronic diseases [in older dolphins, maybe], making it an essential fatty acid, a nutrient that the body does not produce but is essential to health.

Venn-Watson co-wrote this paper to argue for proof of concept for C15:0, but with no human studies. Then she started a company to try to sell C15:0 to humans, since dolphins a) don’t carry credit cards; and b) C15:0 supplements are covered by their navy employee health plan. She also wrote a book to help shill this stuff. And gave a TEDx talk to shill some more. But we have any actual evidence that it works?

Healthier skin/hair? NO
Balanced metabolism? Uh-uh. Deeper Sleep? No chance. 3X more cellular benefits than omega-3? What does this even mean?
Healthier skin/hair? NO
Balanced metabolism? Uh-uh.
Deeper Sleep? No chance.
3X more cellular benefits than omega-3? What does this even mean?

And is it FDA-approved? Hell to the no. Just like all those other untested supplements. Please, oh, please just save your money.

BUT BUT THE FATTY15 WEBSITE!

It says all kinds of things that maybe are true. What about their claims?

Text on a slide discussing claims about essential fatty acids and a related study, highlighting skepticism towards certain assertions.

To sum up:

  • The dolphins are going to be okay.
  • We are going to be okay.
  • Eating food and moving our bodies are good things to do, be we human or dolphin.
  • The one supplement that I personally can recommend is to supplement your viewing by adding Heated Rivalry to your watchlist. You’ll be glad you did.

fitness · swimming

Collegiate swim tests on the decline: a good thing or bad thing? It’s complicated.

I’ve been near and in water for as long as I can remember. I learned how to swim when I was age 4– my teenaged aunts took me to a local creek, put me in the water and taught me dog paddling, lying on my back and front, and how to hold my breath underwater. By age 6, I was able to swim in the deep end of the pool by myself with some confidence. My niece and nephews followed the same pattern: early swim exposure and lessons, and lots of trips to the pool and ocean. All my family are comfortable swimmers.

But not everyone is. In this article in the Economist, we read a short history of the race, class and income gaps that divide swimmers from non-swimmers. Here’s a graph they created from data gathered from the Centers for Disease Control (in 2023, the good ol’ days for the institution…)

A graph showing percentage of US non-swimmers by income. We see big racial gaps even controlling for income.
A graph showing percentage of US non-swimmers by income. We see big racial gaps even controlling for income.

According to the Centres for Disease Control and Prevention, black children aged five to 14 are more than five times as likely to drown in a swimming pool as their white counterparts. Black adults are more than five times as likely as whites to report that they cannot swim. 

Many colleges and universities used to have swim tests as a graduation requirement, but that has been in decline in the past decades. The most recent Ivy League school to drop the swim test is Dartmouth College. This spring will be the first year their graduating class will not consist entirely of people who either passed the swim test or passed a swim class. Why?

It’s complicated.

In addition to the cost and inconvenience if running a swim program for all students, the large racial gaps between swimmers and non-swimmers among college students make some college administrators uneasy. Here’s a quote from the article:

Williams College found that between 2013 and 2019, 81% of those who failed its 50-yard swim test were students of colour. After a university committee deemed this “problematic” in 2022 the faculty voted to scrap the requirement, citing its “disparate impact” on minority students. “You’re reinforcing systemic oppression in some ways,” the school’s athletic director told the Chronicle of Higher Education. When Dartmouth eliminated its own swim test later that year, school administrators offered a similar explanation, noting that those who failed were “overwhelmingly students of colour”.

At the same time, some colleges are leaning into the swim test as a way to “right historical wrongs”, in their view.

In 2024 a Cornell faculty committee voted to retain the university’s swim requirement. In its resolution the committee acknowledged racial disparities in swimming ability but argued that the test should remain precisely in order to help narrow them. “By providing formal swimming instruction”, the committee concluded, “Cornell is doing its small part to help right the wrongs of US history and close the racial gap in accidental drowning in this country.

MIT (my alma mater) has retained the swim test as well. Here’s what they have to say about it:

“We have a very intellectually bright population,” [MIT Director of Physical Education] Sampson Moore said. “Sometimes either they don’t have the time to do it as they’re growing up because they’re really focused on their studies, or they didn’t have access because they were an international student and it wasn’t as common.

“All of our students, I would bet my paycheck, are going to be leaders of something, right? Whether they’re a leader of their family or they’re leader of a department or a corporation, they can influence those around them,” she continued.

Is mandating a swim proficiency test imposing an undue burden on students who have been unduly burdened all their lives? Or is it a benefit, helping non-swimming students learn a valuable life skill?

I talked with a friend who is on Team NO-SWIM-TEST, citing how it can stigmatize and burden non-white students. I am on Team SWIM-TEST because, as a public health ethicist, I really want fewer US children, teenagers and adults to die from drowning.

And I admit, as a lifelong swimmer, I want everyone to have the chance to discover the joy of being a water creature, even temporarily.

But I see the complexity here.

If you find this topic interesting (as I certainly do), check out the book Contested Waters It’s a cultural and racial history of swimming pools in the US, documenting and analyzing the shifts from large numbers of public non-segregated bathing pools in urban areas to private, restricted recreational suburban pool clubs.

What do I wish we could do about this? Look to Australia– they have school-funded swimming and water-safety programs all over the country. However, even in Australia there isn’t full access to and implementation of swimming lessons for all school-age children. This is both a shame and a danger for people living in a country with 34,000 kilometers of coastline.

Readers, what do you think? Obvious, national funding for learn-to-swim programs for children would be a great solution. But in lieu of that, what about learning to swim in college? I’d love to hear from you.

fitness · temperature and exercise

March is the season for silly weather

It’s March, y’all. Where I live this means that almost every item of my wardrobe is on call for potential use, from short-sleeve shirts to merino wool base layers. This week, which is spring break for my university, features some higher temperatures than we’ve seen since early fall, but also some low lows and threat of snowflakes.

The weekly forecast for my town-- all over the place, as March tends to be.
The upcoming forecast for my town– all over the place, as March tends to be.

But this is no news to anyone who’s lived through a March, especially in northern climes. We have to be willing and able to swing wide in our clothing selections, to be nimble in our accessory and footwear choices.

I wrote about this a bunch of years ago when we had a record high temperature in February (73F/23 C) and then a big freeze. You can read about it below, and hopefully just have to experience the March weather shifts vicariously, rather than in person. Enjoy…

fitness · yoga

Why not make March the new January? Looking for March momentum

For me, January and February of this year have been busy and productive work and social months. I’ve hosted people at my house, gone out to social events, and done fun extra-curricular things at school with students. I’ve also written some conference abstracts, made progress on a newish research project and had meetings with my friend and research partner Norah.

But movement? Not so much. Yes, I’ve done a little walking, a little yoga, and went swimming with a friend and her toddler. But I haven’t established, much less adhered to, any sort of schedule or regular plan. And, I fell off the radar of my 226 in 2026 Facebook group.

Well, it’s March 1. What better time to start afresh with a plan for movement momentum?

And I have a plan. Well, rather my local yoga studio Artemis has a plan. It’s March momentum time!

What does this mean for them and me? Well, it’s simple: you just take classes, and with each class you take, you get an entry ticket into a raffle for yoga swag. Check it out below.

An announcement for Artemis Yoga's March Momentum 2026 program, detailing a 31-day yoga challenge with information on sign-up, tracking progress, and prizes.

Yes, I would love a new yoga mat or other prizes, but the main thing here is it’s getting my attention with a fun challenge to restart my yoga practice. And I’m starting TODAY with a sound journey yoga thing for members only. My goal is to do two classes a week for the month of March– one in person and one synchronous online.

Like any good challenge program, there are also extra little incentives. Some classes are designated bonus classes, for which you get TWO raffle entries. I’m going to try to do at least two of those this month.

The last time Artemis ran this challenge, Norah threw herself into it, and she ended up winning a sweatshirt. Imma see if I can score something for myself this time.

What I really want to score, though, is an easier yoga habit. We’ll see how it goes, and I’ll report back in April.

Readers, are you feeling winter sluggishness or in a rut? Are you humming along with your activity schedule? How are your plans going? I’d love to hear from you.

fitness · Olympics · sexism

Alternative party ideas for the US women’s Olympic hockey team (since they’re not going to the White House)

Even if you didn’t read my blog post yesterday about the disrespect of the 7-time medal-winning (since 2000) US women’s Olympic hockey team, you no doubt heard about it somewhere on the internet. To recap:

  • After the US men’s Olympic hockey team won gold, US president T***p spoke to them on the phone, inviting them to the White House, adding he thought he would also have to invite the women, lest he be impeached (for a third time).
  • The hockey players laughed along with T***p, joining in the mocking of their Olympic hockey teammates.
  • The US women’s hockey team politely declined an invitation to the White House, issued after the invitation to the men’s team.
  • Flavor Flav— who, among other things, is the “dedicated hype man” for US Women’s Water Polo, and now apparently, US Women’s Hockey– invited the women’s team to come to Las Vegas for a big party. He has since expanded the invitation to include all female Olympic and Paralympic medalists. You can see for yourself below:

Mr. Flav hasn’t filled out the details of the upcoming festivities, but I can imagine it will be quite the party.

However, I can’t help but think that it would be nice to come up with other ways to express our appreciation for them (and their friends and fellow athletes who also haven’t been sufficiently noticed and feted). Herewith, a few party ideas:

  1. Special axe-throwing events for them to attend, either in person or via Zoom, where the bullseyes have been replaced by, say, images of the faces of politicians who need to learn lessons of respect.
https://en.wikipedia.org/wiki/Flavor_Flav
Whose face would look perfect in the middle there? You be the judge.

2. A complimentary tour of the Hoover Dam, since they’re going to be in Las Vegas already and it’s really close. Also, my sister, niece, nephews and I really enjoyed it when we went.

The Hoover Dam is very grand and also an educational experience.
The Hoover Dam is very grand and also a cool educational experience.

3. My friend James, who lives in Las Vegas and knows the local music scene very well, could show them his favorite bars and hot spots. He also has a nice dog named Baxter and I bet he would let them pet him.

This is Baxter, who is an oldie and a goodie.
This is Baxter, who is an oldie and a goodie.

4. There could be a virtual book swap where we Zoom in to present five of our favorite books from the past year for the women’s hockey team members to choose from, then mail the books to them. No doubt these players have all been busy training and haven’t had much time to catch up on their reading. Doesn’t that sound like fun? I think so.

Olde books, newe books-- all books are good books...
Olde books, newe books– all books are good books…

5. Maybe we can ask those nice guys from Heated Rivalry to come to a special dinner just for them– oh, wait a minute– that one is just for me. Never mind…

Dearest readers, feel free to share your party ideas in the comments below.

fitness · Olympics · sexism

US Men’s Hockey needs a(nother) remedial course on respect for their female colleagues

This year at the Milan Olympics, the US women’s and US men’s teams both won gold medals against Canada. Yes, the men’s result was controversial, but I’m not here to talk about that. Although feel free to advocate for your team in the comments.

In this post, I come to bury the 2026 US Olympic men’s hockey team, not to praise them. Well, bury them via outing them for misogynist yucking it up with the US misogynist-in-chief, Donald Trump, who called them to:

  • congratulate them on their victory;
  • discuss travel arrangements, supposedly courtesy of the American military;
  • dangle the prospect of White house swag for them;
  • mock the US Olympic women’s hockey team, which also won their gold medal match against Canada (uncontroversially), prompting what sounded like near-universal approving laughter from the players.

Here’s what CNN reported about the locker room phone call:

[After inviting the men’s team to the White House for Tuesday night] Trump added: “I must tell you, we’re gonna have to bring the women’s team — you do know that.” If they weren’t invited, the president said, “I do believe I probably would be impeached, OK?”

Members of the team laughed.

Uh, hold on a minute here.

Nadine from Unsplash wants us to just stop now, for a minute. Let's do that. image of a woman's hand indicating stop.
Nadine from Unsplash wants us to just stop now, for a minute. Let’s do that.

For the record, the US Women’s Olympic hockey teams have the following medal count since 2000:

  • 2026 Milano-Cortina: Gold Medal (def. Canada 2-1, OT)
  • 2022 Beijing: Silver Medal (lost to Canada 3-2)
  • 2018 Pyeongchang: Gold Medal (def. Canada 3-2, SO)
  • 2014 Sochi: Silver Medal (lost to Canada 3-2, OT)
  • 2010 Vancouver: Silver Medal (lost to Canada 2-0)
  • 2006 Torino: Bronze Medal (def. Finland 4-0)
  • 2002 Salt Lake City: Silver Medal (lost to Canada 3-2)

That’s a total of 7 medals: 2 gold, 4 silver, one bronze since 2000 for the US women’s teams.

What about the US Men’s Olympic hockey teams? Here is their post-2000 medal count:

  • 2026 (Milan-Cortina): Gold (6-0-0).
  • 2010 (Vancouver): Silver (5-1-0)
  • 2002 (Salt Lake City) Silver Medal

Adding it up, the men’s teams have won a total of 3 medals: one gold, two silver since 2000.

The 7-medals-vs-3-medals fact is one reason among many for the US men’s hockey team, instead of laughing along with and joining in on the sexist bashing of their fellow athletes, should instead:

This bears repeating.

  • Sit down and shut up.
  • Listen for a change.
  • Then do the right thing.

Words to live by for all of us. But especially for these US male hockey players right now.

Hope you enjoyed the first half of the 2026 Olympic Games. The 2026 Paralympic Winter Games run March 6–15. I’m looking forward to them.

fitness · Olympics · skiing

5 things that would make Olympic ski mountaineering (Skimo) even more challenging

Have y’all been watching the winter Olympics? Maybe it’s just me, but it’s seemed even more thrilling and entertaining and awe-inspiring than usual. The women’s speed-skating, women’s and men’s figure skating, the hockey, all those flipping and twirling skiers and snowboarders, the fast-fast-fast downhillers– just wow. And of course the suspenseful curling.

But the ski mountaineering just blew my mind. Skimo is absolutely my worst nightmare of an athletic event. It requires the participants (who must have been willing at some point, though I don’t understand why) to ski uphill, taking off their skis to walk/trot up an inexplicable staircase, put said skis back on, trudge/trot to the top, take the skis skins off (making sure to put them safely in a pouch), and then ski downhill on light-and-skinny skis in an act that one commentator said was like “skiing a steep downhill on two pieces of dried pasta”.

That sounds terrible.

But then, I thought, maybe that’s what makes this sport so appealing– it’s the most tiring, challenging sport they could think of.

But, could we help them out and offer suggestions to make it even harder? I think we can. Here are some ideas I came up with.

1) Like the cross country ski race entrant Nazgul, the Czechoslovakian wolf dog (not to be confused with Heated Rivalry’s stupid Canadian wolf bird), they should allow dogs on the trail. Petting will be permitted, but competitors may not commandeer dog treats for themselves during the race.

2) For the relay races, participants should have to stand in line to buy another lift ticket. They need to make sure they have their credit cards ready, as the Olympic vendors won’t take cash.

3) Like the Tour de France, they could have photographers and team coaches on Sno-Cats, rumbling up and down the hills in between the competitors. Having them shout “go faster!” would be optional.

4)Allow spectators all along the course, screaming, partying, encouraging them with cowbells, and offering them beer hand ups during the stairs part of the race. Non-alcoholic of course, as this IS he Olympics. Honestly, I’m not sure if this will make their job easier or harder. The only way to know for sure is to try it.

5) Require that each competitor take at least 4 selfie photos and post them on social media during the race. So much of what happens doesn’t “officially count” unless it’s been posted, so why not include race results in that category? 🙂 Extra points for selfies with a spectator, and double extra points for a selfie with a dog on the course.

So, readers– any other ideas to make this sport even more chaotic and difficult? I welcome your suggestions.

fitness · nutrition · research · Science

I love coffee, I love tea; when it comes to dementia risk, they love me

Yes, yet another study has come out linking some food/beverage product to increased/decreased risk of something-or-other. In this case, however, it’s about how coffee (and also tea) lower dementia risk and modestly better cognitive function.

I’ll drink to that.

The eight shades of coffee.Thanks Nathan D from Unsplash for the photo.
Many shades of coffee.Thanks Nathan D from Unsplash for the photo.

These results were drawn from very large cohorts of healthcare professionals in the UK that have tracked behaviors and conditions over 40+ years. So this is not a randomized controlled trial. Still, this is how researchers find connections between habits like drinking coffee and health outcomes. So, what did they find this time?

There was a statistically significantly reduced dementia risk, with lowered risks for higher caffeine intake (up to 4 cups a day of coffee, 2–3 of tea; no improvements reported for higher daily intake).

There were very modest reductions in subjective cognitive decline (self-reported by participants) and objective cognitive decline (performance on cognitive tests) in the caffeine consumers. Again, the reductions increased along with caffeine intake, but hit saturation at 4 cups of coffee a day.

A notable fact about this study is that they were able to distinguish the effects of caffeinated coffee and tea (vs. decaf beverages). Caffeine is reported to be neuroprotective and anti-inflammatory (I could insert fancy text from the study, but trust me, it’s very science-y).

But, we also know that caffeine is NOT good for everything that ails us. It can affect sleep quality and cause all sorts of bad upper GI symptoms. But not everything that’s good in one way is good in all ways. That’s simply not coffee’s fault.

So, all’s I’m saying is, Coffee doesn’t drink coffee; people drink coffee…

Oh, and one more thing: I love this ditty– Java Jive– performed here by the Manhattan Transfer. Enjoy with a steaming mug.

fitness · Research Roundup · Science

Research roundup– moving is good and good for us…

Amidst all the chaos and destruction in the world, science is still happening (although the funding situation is also chaotic and destructive, but never mind that for the moment). Interesting questions are being asked, tested, and interesting answers are being given. Here are some of them (mostly courtesy of Sam, who sends these to me– thanks, Sam!)

Question: Does exercise result in a net calorie reduction, or does the body compensate to balance things out?

Answer: we don’t know yet. But, a bunch of scientists are hard at work testing different active subpopulations (from Tanzanian Hadza hunter-gatherers to American collegiate cross country runners) to look for ways that human metabolism responds to energy output. This article from Outside magazine gives a detailed and accessible overview of recent research on the topic.

Good news: even if exercise doesn’t result in a ton of extra calories burned (if that’s your goal), it still results in other good things, like increased longevity, better sleep and overall well-being.

Walking with kids is fun. By Krzysztof Kowalik for Unsplash.
Walking with kids is fun. By Krzysztof Kowalik for Unsplash.

Question: Does cycling make you smarter?

Answer: Maybe, in some ways, for a little bit. Here’s what this article in The Cycling Week magazine had to say about it:

A study published in the Journal of Clinical and Diagnostic Research found that people scored significantly higher on memory, reasoning, and planning tests after just 30 minutes of spinning on a stationary bike.

This effect is primarily linked to the production of a protein called BDNF (Brain-Derived Neurotrophic Factor). BDNF acts like a fertilizer for your brain, helping to grow new cells and protecting existing ones from decay.

Essentially, every mile you ride is an investment in your brain’s structural integrity and future processing speed.

Yay! Does cycling do anything else good to your brain? The article also cites research results suggesting that cycling promotes lower dementia risk, increased neurogenesis (creation of neurons in the hippocampus) and psychological resilience (this last one is less surprising if you’ve tackled big hills at very low speed, as I have).

Riding bikes with kids is fun, too. By Mukkpetebike for Unsplash.
Riding bikes with kids is fun, too. By Mukkpetebike for Unsplash.

Question: Can exercise help reduce my cancer risk?

Answer: yes, a bit. But the research study supporting this is small and very preliminary. Here’s the deal, from an article in Men’s Health magazine:

The researchers looked at 30 men and women between the ages of 50 and 78. All met the criteria for having extra weight or obesity. Each person underwent a short but intense cycling test that lasted about 10 minutes.

Afterward, the researchers collected blood samples from everyone and analyzed them for 249 proteins. Thirteen of the 249 proteins increased after exercise. This included interleukin-6, which helps to repair damaged DNA. Exercise raised the levels of other molecules in the blood that work to reduce inflammation, support blood vessel health, and improve metabolism.

According to the researchers, the evidence showed that 10 minutes of exercise was enough to support DNA repair to lower colon cancer risk. Though keep in mind, these were short but intense bursts of exercise. A slow, leisurely stroll wouldn’t qualify.

There are a bunch of things we don’t know, like what is the amount of reduced risk, and what is the variation in different subpopulations. Plus a bunch of other relevant factors that may influence the effects. Still, it’s good news.

Vigorous exercise is fun, too. By Kaspars Eglitis for Unslpash.
Vigorous exercise is fun as well. By Kaspars Eglitis for Unslpash.

Happy week, everyone, and enjoy some movement!

fitness · training

What more dangerous animal do you want to be?

My favorite training coach of all-time is Steve Weller. We met in 2007 (I checked through emails to confirm) when he did some coaching for my cycling team, North East Bicycling Club. I was (and remained) a beginner back-of-the-pack racer, but I loved the feelings of speed and effort amidst the sounds of my breath and the spinning of the wheels on pavement. Steve and I worked together for several years during and after my days of racing.

I’ve had a lot of coaches and training and instruction in a lot of sports, but Steve stands out as the best. Why? He combines keen analytical intelligence with deep empathy, humor and a sense of perspective about training and competition. And he genuinely loves both the sports of cycling (road, cross, MTB) and the people who participate in them.

In case you’re wondering, I’m writing this because I’m still on his email list and he sent something today that I just loved and had to share with all of you.

Steve wrote in this post about a how he came across the phrase “a more dangerous animal”. And then he said this:

As you push through hard workouts and suffer to hang with the fast group, remember – you are doing this work to become a more dangerous animal.

I cannot tell you how much this tickles and pleases and motivates me. Some thoughts:

Do I want to become a more dangerous animal? Can I?

What keener capacities, what kinds of prowess do I want to cultivate?

In my new proposed powerful state, to whom/what do I want to present a danger?

  • The social status quo?
  • Our current national power structure?
  • The patriarchy?
  • Oppressive institutions?
  • Maybe my own complacency and timidity about change?

And, of course, there’s deciding which animal to embody/channel/aim for. Here are some suggestions, but please feel free to add your own ideas in the comments.

I know it’s midweek, but give yourself a moment to think about this. Rowr! Grrrr! Hissssss! Buzzzzz!

A gallery of six dangerous animals: tiger, crocodile, bee, shark, jellyfish and meerkat.
A gallery of dangerous animals: meerkat (apparently they get very put out if you approach them), jellyfish, bee, tiger, crocodile and shark.