Boxelder bug

Found near female boxelder, maple, and ash trees, often aggregating on sunny southern sides of buildings in autumn.

Sucks sap from leaves, flowers, and developing seeds of host trees using piercing-sucking mouthparts.

Gathers in large, conspicuous clusters during colder months to overwinter, becoming active on warm sunny days.

Harmless to humans and pets, does not bite or transmit disease, but can become a mild household nuisance.