Recent comments in /f/science

Marine__0311 t1_ja9qazx wrote

It's feasible, but highly, unlikely.

Orcas have been observed preying on several aquatic mammal species, but never on a swimming terrestrial mammal. But, some carcasses of moose, and one deer, have been found with bite marks consistent with an orca attack.

Orca pods have different ecotypes, and often specialize on specific prey species. They only occasionally go after prey outside of their preferences.

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PoopIsAlwaysSunny t1_ja9kx3s wrote

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lizcopic t1_ja9igm0 wrote

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somajones t1_ja9af47 wrote

The tag on a black bear a coworker hunted indicated it had swam across east Grand Traverse Bay at some point, a distance of 3 - 5 miles. They are pretty fat though. I imagine it could spend a lot of time just floating and conserving its energy.

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Ppleater t1_ja9a1k3 wrote

It's not so much that they can't swim, but rather that they can't float, so they have to move along the bottom by running along or leaping off the ground. But if they were made more buoyant I bet they'd be powerful swimmers.

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LornAltElthMer t1_ja97xsl wrote

I'm guessing with the walruses it's the flippers that make the difference.

Just going by appearance I'd have guessed a hippo and a manatee would be more closely related, but here we are ;-)

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dasus t1_ja97hen wrote

Oh damn, true, I forgot that, as they're pretty aquatic, but yeah, you are right, they just run underwater, haha.

Eh, they're just the part of the branch that stayed in the shallows. (Whale evolution docs are cool)

Seems like going back from land to water has happened quite a few times. Taxonomy is interesting and your comment made me look a bit, and to my surprise, hippos are more closely related to cetaceans than they are to manatees. I mean, I had never given it any thought before, but I didn't realise how different manatees and dugongs are from cetaceans.

Also, seals and walruses. Weird that a hippo can't swim, but walruses can. They both look heavy enough, but guess hippos do be a bit denser.

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Chalkarts t1_ja95gjm wrote

Who said anything about killing anyone? Just don’t have kids. If people were responsible and being childfree were normalized instead of shunned, We’d be down by a few billion in a generation. Making more modern societal consumers on purpose is selfish and irresponsible.

You don’t have to kill anyone to depopulate. Just stop breeding.

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