this post was submitted on 28 Nov 2025
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Science Memes

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[–] saltesc@lemmy.world 213 points 1 week ago* (last edited 1 week ago) (74 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?

[–] marzhall@lemmy.world 6 points 1 week ago* (last edited 1 week ago) (5 children)

Invertebrates? No. All out

I invite you to meet the awesome jumping spider, whose eyes are very especially needed set up to be forward-facing for depth perception for their jumps, and who hunt other spiders, as well as the wolf spider, who are also a hunting (as opposed to web) spider.

In fact, you can use the chart of spider eye layouts to pretty much identify whether you're looking at a spider who builds webs and waits or a spider who hunts:

 a drawing of different spider faces to their names

Anyone with two big forward-facing eyes is probably looking around for their next meal; the rest are building a web, trapdoor, or taking some other approach.

[–] monotremata@lemmy.ca 3 points 1 week ago (1 children)

Also crabs. I mean, their eyes are often on stalks and more mobile than mammalian eyes, and they're compound, so they have a very wide field of view, but they're still often basically in front, and they do apparently provide depth cues for hunting thanks to this.

https://www.jneurosci.org/content/38/31/6933

It also occurred to me to look up about dragonflies, and it seems they mostly hunt dorsally (which is a pretty viable option if you're flying). BUT I found this article about Damselflies, which notes that they rely on binocular overlap and line up their prey in front of them. Which is pretty cool.

https://www.sciencedirect.com/science/article/pii/S0960982219316641

Horseshoe crabs have nine different types of eyes. Even that tail is essentially a kind of eye, covered with photoreceptors. Not sure of the relevance of this horseshoe crab fact, it's just fucking interesting.

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