There's more than one type of bed bug, and some species are close enough in appearance to fool even a trained eye at first glance.
Knowing which species you're dealing with isn't just a matter of curiosity; it can tell you whether the problem is coming from inside your home, or from something like bats or birds nesting in your attic.
The most common bed bug species, Cimex lectularius, is found worldwide and has spent centuries adapting to life alongside humans. If you have bed bugs, this is probably the species you're dealing with.
They thrive in temperate climates and turn up everywhere people sleep — homes, hotels, apartments, college dorms, etc.
Adults are oval, flat, reddish-brown, and roughly the size of an apple seed. After feeding, they swell and darken. Nocturnal by nature, they sneak out at night for a blood meal before retreating to cracks, seams, and crevices to hide.
The tropical bed bug (Cimex hemipterus) looks almost identical to the common bed bug, so even trained entomologists need a microscope to tell them apart. The main biological difference is that the tropical variant prefers warmer, more humid conditions and struggles to survive in prolonged cold.
It's most common in tropical regions, including parts of Florida, the Caribbean, and Southeast Asia. It's less frequently seen across the continental U.S., but international travel has contributed to occasional sightings in warmer states.
If you're in a region where both species could be present, a trained technician is the only reliable way to know which one you're dealing with.
If you've ever seen a bat bug, you'd be forgiven for thinking it was a bed bug. The two are almost the same without a microscope. The real giveaway? Where they like to hang out and what they like to feed on.
Bat bugs have one preferred host: bats (and sometimes birds). They only feed on humans as a last resort. The problem starts when bats leave or are excluded from a building, and the bugs then migrate into living areas in search of a different host. That's when you might start waking up with bites and assume you have a bed bug problem.
Here's the key behavioral clue: Bat bugs tend to cluster near exterior walls and upper floors, close to where bats roost. If you're finding bites but no evidence around your bed, it's worth checking whether bats are present on your property.
In many cases, identification only really matters when you’re telling bed and bat bugs apart, because the actual treatments for the insects themselves don't differ much from species to species.
However, using standard bed bug treatments on bat bugs can fall short if the real source—bats—hasn’t been addressed. Most bat bugs originate in attics, wall voids, or upper levels where bats roost. Unless that source is removed or excluded, the problem is likely to recur.
Bed bug species are hard to tell apart without the right training. For assistance with bed bug infestations, either call us to arrange a free inspection or click the button below.
There are up to 90 bed bug species worldwide, but in the U.S., most infestations involving people are caused by one main species, the common bed bug.
In warmer areas, the tropical bed bug can also appear, and bat bugs are common look-alikes that can be mistaken for bed bugs.
The common bed bug is the most typical bed bug species linked to infestations in homes, apartments, hotels, and other places where people sleep.