Bed bugs
There are several species of bed bugs, all of which are parasites of warm-blooded animals. The common bed bug, whose preferred host is humans, is rarely encountered, presumably because of improvements in sanitation. Related species, such as the bat bug and bird bug, prefer to feed on bats, birds, and other wild hosts, but will also feed on humans if the opportunity arises or the preferred host dies or leaves the roost. Adult bed bugs are about 1/4-inch long and reddish-brown, with oval, flattened bodies. Bed bugs prefer to hide in cracks and crevices during the daytime and come out to feed on the host's blood at night, usually while the host is sleeping.
