Fleas are very tiny insects that will not only bite animals, they feast on humans too.
94% will bite on mammals, while 6% parasitic on birds.
The species with medical importance is Xenopsylla sp. They have no wings but 3 pairs of powerful legs for jumping from one host to another.
Fleas have triangular head, a pair of conspicuous eyes, club shaped antennae and a mouth part pointing downwards. Both sexes of fleas take up blood meal and hence can serve as vector.
Where are they usually found?
Fleas are often found sheltering among hairs, under clothing and bed.