Posts with the tag: bio-inspired

Why do animals have differently shaped pupils?

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Only the least observant could fail to notice that pupils come in striking different shapes. Not in humans, of course, where they are invariable circular, but in many other terrestrial animals where they are sometimes round, but also often elongated and slit-like. The orientation of these slits also varies; most predators, including your neighbourhood tabby, have vertical slits, while in prey animals they are more likely to be horizontal. This intrigued a team of optometrists and physicists from the University of California, Berkeley, and Durham University (UK), and so they set out to discover what drives these variations. And in a paper published in Science Advances1, they think they have the answer.
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  1. Banks, Martin S., et al. “Why do animal eyes have pupils of different shapes?.” Science advances 1.7 (2015): e1500391