Pest Library Mice House Mouse

House Mouse

Mus musculus

The house mouse is the main rodent found in New York City and is an “obligate commensal, ” meaning it lives exclusively in close association with humans and is rarely found in wild habitats.

About this species

House mice are curious toward new objects (neophilia), making them initially easier to trap than rats. However, within mouse colonies, dominant mice stay tucked away in safe hiding spots while younger mice explore and encounter traps first. This means trapping alone often fails to eliminate the breeding population in wall voids, which is why sealing entry points is essential.

Image by Donald Hobern from Copenhagen, Denmark, CC BY 2.0, via Wikimedia Commons

Identification

Size:

Body length 2½–3½ inches (65–95 mm)
Tail adds another 2½–4 inches (63.5–101.6 mm)
6–8 inches (150–200 mm) total

Color:

Light brown, gray, or dusty tan

Image by W.A. Djatmiko, CC BY-SA 3.0, via Wikimedia Commons

Key ID Features:

Nearly hairless tail, the same color as body
Uniform coloration (belly only slightly lighter than back)
Large ears relative to head size
Small beady eyes