Bat Bug

Scientific Name: Cimex adjunctus

Order & Family: Hemiptera, Cimicidae

Size: 4-5 mm (adults)

Bat Bug

Natural Habitat

Typically found in close proximity to bat roosts, such as attics, walls, and eaves of buildings. They can also appear in living spaces if their bat hosts are removed or if bat populations are high.

Diet & Feeding

Primarily feeds on the blood of bats, but will bite humans if bats are not available.

Behavior Patterns

Nocturnal feeders, hiding in crevices and cracks during the day. They are attracted to carbon dioxide and body heat. Unlike bed bugs, they prefer bat hosts, but their bites are similar to those of bed bugs, causing itchy welts. They can be found in large numbers near bat roosting sites.

Risks & Benefits

Potential risks include itchy and irritating bites, which can sometimes lead to secondary skin infections from scratching. They are not known to transmit diseases to humans. Benefits are indirect, as they are part of the ecosystem that includes bats, which are beneficial for insect control. However, presence in homes is generally considered a pest issue.

Identified on: 9/9/2025