Fleas can infest homes in high numbers with the right environment, most times including a pet of some type, in a very short amount of time. Flea bites are most times noted on humans from the knees down and may bother some people more than others. Adult fleas, which are slightly more than 0.3 cm long, have broad, rather flat bodies, short antennae, and piercing and sucking mouth parts; their eyes are either minute or absent. Their long, powerful legs enable them to leap relatively high into the air. A proper approach to a flea infestation is your best tool in alleviating the problem.