There are several million species of animals on the earth, many of which are considered natural wildlife. They range in size from nearly microscopic mites to the 100-foot-long blue whale. Wild animals exist in every habitat, from polar bears in the North Pole to caracals in the African savanna.
At up to 105 feet long, blue whales are not only the largest species of animal alive, but they are also believed to be the largest to have ever lived, as of 2015. By contrast, some mites measure a mere 0.0002 millimeters in length.
Polar bears are among Earth's largest mammals and predators. They are physically adapted to their cold environment by a thick layer of fat and insulating fur. The caracal is adapted to its hot, dry environment by its ability to pass long amounts of time without drinking water.