of Tualatin River National Wildlife Refuge
Image of a coyote in tall, brown vegetation by Ken Campbell

Many mammal species, large and small, use the various habitat types on the refuge. Large mammals such as black-tailed deer and the occasional elk are observed on the refuge.

Smaller mammal species such as coyote, river otter, bobcat, raccoon, beaver, muskrat, and mink are present on the refuge, but are less frequently observed. Smaller, yet more numerous, are squirrels, voles, mice, and shrews. Bats are also known to use refuge lands.

From 2003 to 2005, a small mammal survey was conducted, which identified 14 species on one parcel. By far the most numerous species in this study was deer mouse.

Facts About Mammals