There are over 2000 species of the flea known in the world. The most common of these is the cat-flea. Although its name indicates its general preference, this flea is highly adaptable and will just as easily live on dogs.
Fleas will bite humans when they are in need of the rich protein source given by our blood, usually necessary for egg production. Fleas have a life span of approximately 21 days, however in this time they are capable of laying over 700 eggs. The larvae of the flea will cocoon after two weeks of hatching, however flea pupates can remain in a state of hibernation for up to a year until the presence of a potential host is felt.
Fleas can be responsible for the outbreak of allergenic skin reactions, blood borne diseases and the spread of tape worm when transferring from one host to the other.