American Bullfrog
The American bullfrog is a large species of amphibian that lives in the swamps, ponds and lakes of the USA and Canada. Depending on its environment, it may be dark green, pale green or pale brown dorsally with a paler coloured belly. It may have darker spots on its back and a banding pattern on its legs, although some variations of the bullfrog have no pattern. The American bullfrog is sexually dimorphic; females are larger than males, and males have distinctive yellow coloration on their throat and a much larger tympanum (ovular hearing gland) on the sides of their head.
Black-Tailed Prairie Dog
The black-tailed prairie dog is a species of rodent that lives in the prairies, grasslands, semi-deserts and steppes of the USA as well as small areas of Canada and Mexico. The black-tailed prairie dog has sandy coloured fur with paler coloration on the underside. They have long claws, small ears, black eyes and a black tipped tail. Males are slightly larger than females, but otherwise they are the same in appearance. Black-tailed prairie dogs weigh between 0.68- and 1.36kg, have a head-body length of 36 to 43cm and a tail length of 7.6 to 10.2cm.