: Most have large eyes made of many tiny lenses, which are excellent at detecting motion. Major Roles in Nature
: They are a critical link in the food chain, providing high-protein meals for birds, reptiles, amphibians, and mammals. The Insects
: Scientists estimate there are roughly 1.4 billion insects for every human on Earth. : Most have large eyes made of many
To be classified as an insect (class Insecta ), an animal must typically have: providing high-protein meals for birds