4. Black Rhino
They are also called a “Hook-lipped” rhinoceros because of the shape of their mouth, and as you might expect, they are unfortunately on the critically endangered species list. The western black rhino, which is part of the subspecies, was declared extinct 4 years ago due to constant poaching, by humans for their horns.
They can be found in eastern and central Africa, specifically in Kenya, Tanzania, South Africa, Namibia, Zimbabwe, and Angola to name a few. They are also one of the oldest living mammals on Earth, which sort of makes them living fossils. Unfortunately, even with efforts to preserve their species, poaching is still evident today, thus the dwindling population of the black rhino.