The wings are visible during development so these insects are also called exopterygotes . Note that this plan has not been followed in our Romoser and Stoffolano text. They are transmitted from one host to another by direct contact. Eggs are normally attached to hair or feathers of the host. Lice can be important pests of domestic animals, especially poultry.
Heavy infestations can cause loss of weight.
They are transmitted from one host to another by direct contact. Eggs are normally attached to hair or fur of the host, some attach to the clothing of humans. Lice can be important pests of humans and animals. Certain species can be disease vectors. The body louse can be a vector of epidemic typhus.