Night butterflies have ears on their wings so they can avoid bats. Monarch caterpillars shed their skin four times before they become a chrysalis, growing over 2700 times their original size. Of the huge numbers of insects, only a tiny amount, one percent, are harmful to humans.
Most insects are harmless or actually beneficial.
Locusts can eat their own weight in food in a day. A person eats his own body weight in about half a year. The desert locust is the world's most destructive insect. It can eat it's own weight in food every day. Large swarms can gobble up to 20,000 tons of grain and plants in a day.