The Javan rhinoceros is the world’s most endangered mammal. Only 60 of them still exist, and with a birth rate of about one a year, they aren’t expanding very fast. Almost all of them live in the same Indonesian national park, so researchers have set up 34 cameras to try and watch their behavior. The researchers hope to figure out a way to keep the species alive before it’s too late. Watch the video below for a closer look at this rare mammal.