Photo: kalvinchan, CC BY 4.0, via Wikimedia Commons
Kansas City Pest Identification
Cimex adjunctus (eastern bat bug)Bat Bug Identification
A close relative of the bed bug that normally feeds on bats, found when a bat colony has roosted in an attic or wall void and then either leaves or is excluded, leaving the bugs to seek a new host — sometimes people.
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How to Identify It
Nearly identical to a bed bug in size, shape, and reddish-brown color; reliably distinguished only under magnification (bat bugs have longer hairs on the pronotum). In practice, the presence of bat guano or a known bat roost nearby is the key clue.
Size: 4–5 mm
Commonly Confused With
Bed bugs — visually almost indistinguishable without magnification, which is why finding activity near an attic or chimney (versus a bedroom) is the important diagnostic clue.
Why It Shows Up
They live with a bat colony, typically in an attic, soffit, or chimney. If the bats leave or are excluded without also addressing the bugs, they can migrate into living space looking for a blood meal.
Where Homeowners Find It
Attics, soffits, and chimneys near or formerly housing a bat roost; occasionally migrating into upper-floor rooms adjacent to an attic.
Seasonal Activity in KC
Tied to bat activity, which in this region is most active April through October.
Risk Level
Bites similar to bed bug bites — itchy and irritating, though bat bugs are generally considered less likely to establish a long-term human-feeding population.
What You Can Do Yourself
- • Do not attempt bat exclusion yourself — bats are protected under Missouri and Kansas wildlife law during certain periods, and exclusion needs to be timed correctly.
- • If bat activity is suspected in the attic, get it inspected before addressing any bug activity.
What Professional Treatment Involves
This requires coordinating bat exclusion (by a licensed wildlife professional, timed to avoid trapping bats or separating flightless young) with pest treatment of the vacated roost site to address remaining bat bugs. We can advise on the process and treat the insect side.
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Common Questions
How do I tell a bat bug from something that looks similar?
Bed bugs — visually almost indistinguishable without magnification, which is why finding activity near an attic or chimney (versus a bedroom) is the important diagnostic clue.
Do I need professional treatment for bat bug?
This requires coordinating bat exclusion (by a licensed wildlife professional, timed to avoid trapping bats or separating flightless young) with pest treatment of the vacated roost site to address remaining bat bugs. We can advise on the process and treat the insect side.