The most common species observation along highways are deer (mule deer or white-tailed deer), elk and pronghorn. You can learn more about these species here.
There are lots of other species you may see on the highway, please refer to Wildlife Roadkill Identification Pocket Guide to learn more.
White-tailed deer have a white underside to tail
White-tailed deer have smaller ears relative to mule deer
Mule deer have a black tip at the end of their tail
Mule deer have large ears relative to white-tailed deer
Elk have a cream-coloured patch on rump
Elk have a shaggy mane -- a dark, thick scarf of fur that hangs from its neck to its chest
Males have large antlers while females have not antlers.
White rump patch and under belly
White patterns on neck
Black on end of nose
Black horns which both males and females can have.