this post was submitted on 28 Nov 2025
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Science Memes

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[–] saltesc@lemmy.world 203 points 2 days ago* (last edited 2 days ago) (61 children)

I think that's specific to mammals. Just off the top of my head...

Invertebrates? No. All out

Fish? No. Also a Hammerhead would've really sold this comic lol.

Birds? No. Though, even on the side they do often have a tilt toward frontal in a lot of predatory birds. It could be argued...

Reptiles? No.

Amphibians? No. There's no even trying to place rules on that optical chaos.

Mammals? Yeah, pretty much. Can't think of an outlier but I'm sure there's plenty of obvious ones.

Edit' Ah, there we go. Of course marine mammals are an exception. But back in land, as too are llamas. Makes you wonder...what are the llamas plotting?

[–] Typhoon@lemmy.ca 4 points 1 day ago (4 children)

Most primates eat fruit or leaves, but have forward facing eyes because they need depth perception for climbing/jumping, not for hunting.

[–] ChickenLadyLovesLife@lemmy.world 1 points 1 day ago* (last edited 1 day ago) (3 children)

Squirrels have eyes on the sides of their heads and they're pretty fucking good at climbing and jumping. Next theory ...

[–] Fedizen@lemmy.world 1 points 1 day ago (1 children)

If a squirrel falls they're probably not going to squish as hard as a monkey. Lots of scavengers also have forward facing eyes (ex racoons) and pandas notably have forward facing eyes and are herbivorous.

I think the climbing and jumping theory is better than the predator theory on account that it explains why large aquatic animals aren't selected for close frontal eyes.

Plus many predators (cats notably) do climb and jump. Humans and monkeys also have werd postures that might lead to them falling over easier.

In reality its probably never just one pressure that leads to these kind of evolutions.

[–] Atomic@sh.itjust.works 2 points 1 day ago

You don't need a unified theory of why animals have binocular vision.

The biggest threat to a primate isn't always felines, it's often other primates. Judging distance to your target is a very beneficial trait for survival if you need to fight them. Which means if you need to survive other primates, it is beneficial to be able to judge distance to other primates. Even if you're not a predator.

Gorillas might be herbivores. But they are excellent at fighting eachother. And a dead gorilla can't reproduce.

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