Fleas: Size: Adult fleas are no larger than 1/8-inch long. Color reddish-brown, wingless insects are laterally compressed, so they look as if they are walking on edge. Cat fleas have both pronotal and genal combs. They have piercing-sucking mouthparts through which they obtain blood meals from their hosts.
Life Cycle: Females lay about 20 to 50 eggs per day. An adult cat flea generally lives about 30 to 40 days on the host. You can find fleas on pets throughout the year, but numbers tend to increase dramatically during spring and early summer when conditions favor larval development.