Most insects do have wings. Fleas, lice, silverfish, and firebrats

are the only truly wingless insect groups that most of us are familiar with. Most adult insects have two pairs of wings, but they're not always visible. ... The second pair of clear, membranous wings are folded up underneath.

Why don t all insects have wings?

Immature insects never have wings because they have not developed yet. ... These include some grasshoppers, many parasitic insects (like lice and fleas), a number of beetles and even some moths (the bagworm for example). The ancestors of these insects had wings, but their ultimate life style did not require flight.

Which insect has no wings to fly?

Apterygota are a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history. They include Thysanura (silverfish and firebrats).