Meet a very special marine mammal - a porpoise we call Vaquita. The Vaquita is not a dolphin. It's a porpoise, and a very special one, toos.
What makes this porpoise species so special? They're special because they are so rare. They are, in fact, the world's most endangered marine mammal. People rarely see porpoises, since they, unlike dolphins, are not inclined to 'socialize' with humans.
An additional reason that the Vaquita Porpoise is rarely seen is that it lives in just one spot on earth, and there are very few of them there. Indeed, scientists estimate the total population of this species is around 200. Yes, just two hundred - maybe even fewer!
Image: Vaquita Porpoise, P.D., courtesy NOAA