Norway rat

Norway rat other teeth sq

Close-up of underside of a Norway rat head, showing front incisor teeth.

Characteristic sign is pairs of incisor teeth marks or holes that are about 2 mm wide.

Photograph: By Muhammad Mahdi Karim (Own work) [CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia Commons