Mr. Stubs is the first alligator with a prosthetic tail. The alligator, which lost his tail as a youth after a fight with another gator, was brought to the Phoenix Herpetological Society in 2005. Inspired by “Dolphin Tale” a team of experts dove into the task of discovering the type of tail a gator would need.
Mr.Stubs used his front legs to swim. It was a poor substitute because usually alligators use their long and powerful tail. Luckily, Mr.Stubs has been fitted with a prosthetic tail. He’s learning to grow into it and use it. (Source)