The latest aerial survey puts the hippopotamus population in northeastern Congo's Virunga National Park down to under 1,000 animals, compared to some 29,000 in 1974.
For today's story getting a 10 out of 10, a two-month-old baby that already weighs 50 pounds, meet Petunia, a two-month-old baby hippopotamus at the Metro Richmond Zoo in Virginia.
You could walk alongside a hippopotamus on safari or wear a spinny hat and get rambunctious with friends at a concert by Bieber, Drake in the weekend, and you wouldn't even have to leave your room.
The researchers said the tools date back to about 2.9 million years ago, when early humans used them to cut up hippopotamuses and other big animals for food.