Fleas are about 1/8 inch long and black to reddish-brown. They are wingless and laterally flat.
Fleas generally prefer cats, dogs, rabbits, rats, etc. but will readily feed on humans as well. Adult fleas try to remain on the host animal for their lifetime. They can also be found in pet bedding, resting areas, carpet and furniture.
Their main source of food is blood.
Adult females lay 4 – 8 eggs after each blood meal. The eggs fall wherever the host animals happens to be at the time. The eggs hatch in approximately 10 days. The flea goes through a complete metamorphosis, from egg to adult could take as little as 16 days or up to a year or more.