It’s not the question if the eyes on the side or in the front, it’s about the capability to be able to focusing on a stereoscopic vision to be able to calculate the distances to the prey or not.
Side eyes increase the field of vision, which can be advantageous for fleeing animals, but does not exclude that predators can also use it to strategically locate themselves better in the environment.
But it is true that animals with frontal vision are generally predatory.
There are lots of reasons to have binocular frontal vision. Redundancy, differing info for optic flow, sensitivity, reducing the frontal blind spot, compensating for retinal blind spots, higher frontal resulution, seeing around things, depth perception…
Most of there are good for predators, but predation isn’t the only reason to have them.
They also have to orient themselves in a truely 3D landscape, unlike terrestrial predators who hunt on basically a 2D plane. Birds of prey (with the exception of owls) also don’t have front-facing eyes, probably for similar reasons* (and they’re stereoscopic vision also works a bit different I think with very different points of focus).
Well, better as front-faces, the capability to focus on a point in front, since a 3D vision is essential for a predator, to be able to accurately calculate distances.
Insects and arthropods often combine side and frontal vision, if they are predators, obtaining a vision in practically 360º, for example dragonflies and also jumping spiders or hunters, these usually have two large eyes in front and 6 smaller side eyes. Chameleons solve this with eyes that can move independently, only focusing on the front before the attack. In small animals a wide field of vision is necessary, even if they are predators, since they themselves appear on the menu of others.
Hm, in small animals my previous point of a 2D vs 3D space is also valid. Large land prey animals “only” have to look from side to side to spot predators. Small animals have to look in all 3 dimensions, like sharks
It’s not the question if the eyes on the side or in the front, it’s about the capability to be able to focusing on a stereoscopic vision to be able to calculate the distances to the prey or not. Side eyes increase the field of vision, which can be advantageous for fleeing animals, but does not exclude that predators can also use it to strategically locate themselves better in the environment. But it is true that animals with frontal vision are generally predatory.
Well…
There are lots of reasons to have binocular frontal vision. Redundancy, differing info for optic flow, sensitivity, reducing the frontal blind spot, compensating for retinal blind spots, higher frontal resulution, seeing around things, depth perception…
Most of there are good for predators, but predation isn’t the only reason to have them.
They also have to orient themselves in a truely 3D landscape, unlike terrestrial predators who hunt on basically a 2D plane.
Birds of prey (with the exception of owls) also don’t have front-facing eyes, probably for similar reasons* (and they’re stereoscopic vision also works a bit different I think with very different points of focus).*see comments below
Wrong, all birds of prey have front-facing eyes, not only owls
Haha, I’m not a bird person and didn’t bother to look it up. Thanks for the correction!
Although they still don’t look fully front-facing like e.g. in cats, right?
Well, better as front-faces, the capability to focus on a point in front, since a 3D vision is essential for a predator, to be able to accurately calculate distances. Insects and arthropods often combine side and frontal vision, if they are predators, obtaining a vision in practically 360º, for example dragonflies and also jumping spiders or hunters, these usually have two large eyes in front and 6 smaller side eyes. Chameleons solve this with eyes that can move independently, only focusing on the front before the attack. In small animals a wide field of vision is necessary, even if they are predators, since they themselves appear on the menu of others.
Hm, in small animals my previous point of a 2D vs 3D space is also valid. Large land prey animals “only” have to look from side to side to spot predators. Small animals have to look in all 3 dimensions, like sharks
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