The most common bedbug found in the home is the common household bedbug, or Cimex lectularius. Found throughout the world, these tiny insects thrive in temperate climates and eat human blood. These bed bugs are approximately 1/4 inch in length and brown in color. After feeding, they take on a reddish hue and swell significantly.
Bat bugs, or Leptocimex boueti, are very similar household bedbugs. They are most commonly found in tropical locations, where they feed off the blood of bats. Although bats are their primary hosts, some do select human hosts---particularly in homes where bats are present. Bat bugs look almost identical to bedbugs. In fact, the two can only be distinguished when viewed under a microscope.
Barn Swallow Bugs
As their name suggests, these parasitic insects generally reside in the nests of swallows, where they survive on the blood of the birds. When the swallows migrate and the barn swallow bugs lose their food supply, they have been known to enter the homes of humans to find a new host. They look and behave the same as household bedbugs, invading couches, bedrooms and other areas where humans spend a lot of time resting.
Another close relative of the bedbug is the poultry bug. These bugs are common in chicken coops, where they come out during the night to feed from chickens, turkeys and other fowl. Humans who spend a lot of time around chickens are susceptible to poultry bug bites as well, particularly in the evening hours. Evidence of poultry bug bites is similar to that of household bedbug bites: both leave small, red, itchy bumps.