Bright light attracts nocturnal insects. This phenomenon is called phototaxis. The strength of the light also influences the movement of the wings of an insect. When the light from a distant source, for instance moonlight in equal intensity reaches both the eyes of an insect, it flies in a straight line with both the wings moving in the same way. But if the light source is closer, for instance a bulb or a candle flame, it is perceived more strongly by one eye than by the other.
Bats are mammals that come out at dusk and hunt insects.
But bats can eat many other things. Fruit bats eat mostly fruit and nuts and are bigger than the insect-eating bats. Fish-eating bats live in Mexico and Brazil. They come out at night and eat fish. Long-tongued bats found in South America eat nectar and pollen with the help of their long tongues.