Bat bugs have a similar appearance to bed bugs and in the same family of insects. To distinguish a bat bug from a bed bug, measure the hair the hairs behind the head. If the hair is longer than the width of the eye, it is not a bed bug and most likely a bat bug. Bed bug hairs look nicely trimmed and short.
Bats are the primary host for bat bugs. When bats find a roost inside building, bat bugs can become a problem. Bat bugs can bite humans but their primary host is bats.