There are endangered animals, and then there are those that are the last of their kind. The world's rarest animal is just that.

Start the day smarter. Get all the news you need in your inbox each morning. The vaquita is the rarest animal in the world and the rarest marine mammal. These porpoises swim in the Gulf of ...

According to SF Gate, the 2-inch-long fish is one of the rarest creatures on Earth and ... raised a backup colony of the species, to the animal's natural home. Never miss a story — sign up ...