1) Prong-horn Antelope
Big Horn Sheep
The buffalo acted tame - we even saw one strolling though the parking lot at Old Faithful. However, we were warned they are wild and occassionally gore people when aggravated.
Coyote
Chipmunk - a larger than normal species.
Female elk
This male elk had a harem of more than 11 females. The group likes to hang out in Mammoth Hot Springs late afternoon and evening, but goes wild during the day. They come with an entourage of park rangers that make sure tourists don't get too close.