A property of light that is invisible to humans is routine to help animals get about.
A property of light that is invisible to humans is routine to help animals get about. Birds are known for remarkable quality of vision. They have larger eyes, as a proportion to body size, than other animals, and the eyes are adapted, for a wide field of view range, for grazers, or sharp focus, for birds of prey. The colour-sensitive nerve endings too, in the eyes of birds, fish and reptiles, are specialized and of four kinds, against single kind that we have, and this helps some of them see in the ultra-violet too. Insects have compound eyes, which help them cover a very wide angle of view by each eye and detect very fast movement. And then, some snakes have ‘pits’, which are like eyes and can detect the warmth of prey in pitch darkness.
But a most remarkable feature of birds and insects is that they can sense…
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