Devils Hole Pupfish
Talk about endangered: These fish live in just one cave in the Mojave Desert in Nevada, swimming in steamy water that stays at 93 degrees Fahrenheit (33.9 degrees Celsius) all year. There are fewer than 300 of them alive today, surviving in water so low in oxygen that most other species would die, with food resources so scarce that the fish are always basically starving—and their numbers are so low that they are some of the most inbred animals on the planet.
Human intrusion on their habitat and overuse of water resources in the area led the pupfish to reach an all-time low of just 35 fish in 2013. Their numbers have since rebounded slightly in the wild, and there are another 400 alive in captivity.
