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Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
Pages in category "Lists of largest animals" The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes. *
Size of Paraceratherium (dark grey) compared to a human and other rhinos (though one study suggests Palaeoloxodon namadicus may have been a larger land mammal). The blue whale is the largest mammal of all time, with the longest known specimen being 33 m (108.3 ft) long and the heaviest weighted specimen being 190 tonnes.
It was estimated to grow around the same size as the aforementioned domestic horse. The largest of the tapirs is the Malayan tapir (Acrocodia indica), the only member of the family outside of South America. Maximum size is about 2.5 m (8.2 ft) in length, 1.2 m (3.9 ft) tall at the shoulder, and up to 540 kg (1,190 lb) in weight. [96]
The largest known species of bacterium is named Thiomargarita magnifica, which grows to 1 cm (0.39 in) in length, [42] making it visible to the naked eye and also about five thousand times the size of more typical bacteria. [43] BBC News described it as possessing the "size and shape of a human eyelash."
The heaviest land mammal is the African bush elephant, which has a weight of up to 10.1 t (11.1 short tons).It measures 10–13 ft at the shoulder and consumes around 230 kg (500 lb) of vegetation a day.
The Indian rat snake (Ptyas mucosa) is also very large with maximum sizes of up to 3.7 m (12 ft), making it the second-largest species in the genus Ptyas. [61] [62] The Tiger rat snake (Spilotes pullatus), which usually grows to about 3 m (10 ft), has been reported to reach up to 4.2 m (14 ft), ranking it among the largest colubrids. [63]
Pages in category "Animal size" The following 17 pages are in this category, out of 17 total. This list may not reflect recent changes. B. Bergmann's rule; C.