Toads

From the U.S. Fish and Wildlife Service:

Toads can be a familiar sight in summer depending on where you live. Pictured below though, is a Wyoming toad, which used to be more common on parts of the Laramie Plains in Wyoming, at least into the early 1970s. Their populations crashed in the mid 1970s and they're now considered the most imperiled amphibian in North America. Alongside many others, we're working to help this toad: http://1.usa.gov/1GqWMIx
Photo: Ryan Moehring, fws.gov