Animal including salt water, hydrothermal vents, fresh water, hot springs, swamps, forests, pastures, deserts, air, and the interiors of animals, plants, fungi and rocks. Animals are however not particularly heat tolerant; very few of them can survive at constant temperatures above . Only very few species of animals (mostly nematodes) inhabit the most extreme cold deserts of continental Antarctica. The blue whale ("Balaenoptera musculus") is the largest animal that has ever lived, weighing up to 190 metric tonnes and measuring up to long. The largest extant terrestrial animal is the African bush elephant ("Loxodonta africana"), weighing up to 12.25 tonnes and
Largest prehistoric animals litoptern was "Macrauchenia", which had three hoofs per foot. It was a relatively large animal, with a body length of around . The largest notoungulate known of complete remains is "Toxodon". It was about in body length, and about high at the shoulder and resembled a heavy rhinoceros. Although is not complete, the preserved fossils suggests that "Mixotoxodon" were the most massive member of the group, with a weight about . The largest-known oxyaenid was "Sarkastodon" weighing in at . The largest hyaenodontid was "Megistotherium" at 500 kg. The largest mesonychid was "Mongolonyx robustus". This predator would have been tall