Why would an animal want to look like a leaf or a twig? To stay alive! Birds, lizards, monkeys, and even snakes can chow down on a grasshopper or caterpillar. But insects that can blend in with the background have an edge that helps keep them alive.
You inhale about 25,000 times a day, and you swallow dozens of times in a single meal. Your heart beats between 60 and 100 times a minute, even when you aren’t doing much.
