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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.
More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]
Silky sifaka (Propithecus candidus), fewer than 1,000 still alive. The World's 100 most threatened species[1] is a compilation of the most threatened animals, plants, and fungi in the world. It was the result of a collaboration between over 8,000 scientists from the International Union for Conservation of Nature Species Survival Commission ...
List of marsupials by population – Wombats, koalas and kangaroos. List of lagomorphs by population – rabbits, hares, and pikas. List of other Afrotheres by population – seacows, sengis, golden moles, otter shrews, tenrecs, hyraxes and the aardvark. List of rodents by population – cavies, squirrels, springhares, mice, beaver etc.
List of individual bears. List of giant pandas. List of individual birds. List of individual cats. List of longest-living cats. List of individual dogs. List of longest-living dogs. List of individual elephants. List of historical horses.
A. List of amphibian genera. Animals in War & Peace Medal of Bravery. List of animals with horns and tusks. Arthropod bites and stings. List of animals featuring external asymmetry.
List of largest land carnivorans. List of largest cats. Largest cervids.
Charismatic megafauna are animal species that are large—in the relevant category that they represent [1] —with symbolic value or widespread popular appeal, and are often used by environmental activists to gain public support for environmentalist goals. [2] In this definition, animals such as penguins or bald eagles can be considered ...