What Are Fleas Classified As?

Fleas are tiny, wingless insects that may be important vectors of disease. Fleas have flattened bodies and a row of broad, flattened spines along the body. They also have well-developed legs, and their hind legs are enlarged for jumping. Fleas lay eggs on the hair and feathers of their hosts, and they are also capable of leaping quite high.

Fleas have four stages of life. The lifespan of an adult flea is typically two to four weeks, and multiple generations can occur in a single year. Fleas are often present on their hosts throughout the year, although their population peaks in late summer or early fall.

Fleas are an important threat to people and pets. Their bites can cause serious reactions and lead to secondary infections. Most fleas bite humans and animals on the legs and ankles. The bites usually appear as a small red spot or cluster of two or more. They can also bite people while they are sleeping. Their mouthparts are modified to sucking blood, and they have barbed stylets on them that aid in penetrating the skin.

Fleas can transmit diseases including typhus, tularemia, dog tapeworms, and plague. Some people can be particularly susceptible to flea bites, especially if they are sensitive to flea saliva.