The cat flea belongs to the insect order Siphonaptera which in its adult stage is an obligatory hematophage.Adults of both sexes range from 1–2 mm long and are usually a reddish-brown colour, although the abdomens of gravid females often swell with Family: Pulicidae.
Flea, the common name for the order Siphonaptera, includes 2,500 species of small flightless insects that survive as external parasites of mammals and birds.Fleas live by consuming blood, or hematophagy, from their hosts.Adult fleas grow to about 3 mm (0.12 in) long, are usually brown, and have bodies that are "flattened" sideways or narrow, enabling them to move through their host's fur or Class: Insecta.
Medicines your cat eats. The pill nitenpyram (Capstar) kills adult fleas on your cat within 30 minutes. It doesn’t have any lasting effects, though. Spinosad (Comfortis) is a fast-acting chewable that starts killing fleas before they lay eggs. It provides a full month of flea .