Rhinoceros

The Rhinocerotidae family are some of the world's heaviest animals. There are five species with subspecies, two of which are located in Africa and three in Asia. The 4.5-ton white rhinoceros is near-threatened. It's not white at all, but rather brown or gray, and some believe its name comes from a misinterpretation of the Dutch or Afrikaan word for its "broad" lips.

The vulnerable Indian rhino is well-known for its folds over its rump, back, and shoulders. At 4 tons, it is slightly lighter than the white rhino. The black rhinoceros and Javan rhinoceros are much smaller, weighing only 2.9 and 2.3 tons, respectively. The black rhinoceros, which possesses a hook on its lip that allows it to catch leaves to eat, is critically endangered, with three subspecies now extinct. The Javan rhino is much more endangered, and while it used to be spread all over Asia, it is now only found on the island of Java.

Weight: 4.5 tons