Insects evolved about 200 mya, with cockroaches and dragonflies among the first to appear. Most insects have one or two pairs of wings. They are the only invertebrates that fly. Most have compound eyes , and can communicate by sound and scent, using powerful chemical hormones called pheromones . These mouthparts are highly modified in various groups for chewing, sucking, and piercing.
Insects undergo metamorphosis as they develop, changing from one form to another as they mature.
The juvenile stages look like tiny versions of the adults. They not only look different, they live in different places and eat different food. To Do and View Observe the preserved arthropods on display. Watch the way the millipede moves . Look at the legs.