Fleas are small flightless insects that live as external parasites of mammals and birds. Fleas live by ingesting the blood of their hosts and grows to about 3mm and they lack wings. Dogs and Cat fleas are brownish-black to black in color, but once they have taken in blood, they become reddish-black. Adult fleas of these species are small – roughly ⅛ inches in length. Human fleas (Pulex irritans) and Oriental rat fleas are colored reddish-brown. Once fleas invade a house they can bite both pets and humans. Fleas often enter yards and homes via Pets/wildlife.
