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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]
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 .
List of bats by population – Chiropterans. List of elephant species by population – Elephants. 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 ...
Population sizes range from the Falkland Islands wolf, extinct since 1876, to the domestic dog, which has a worldwide population of over 1 billion. [1] The body forms of canids are similar, typically having long muzzles, upright ears, teeth adapted for cracking bones and slicing flesh, long legs, and bushy tails. [2]
The number of accepted species in Felidae has been around 40 since the 18th century, though research, especially modern molecular phylogenetic analysis, has over time adjusted the generally accepted genera as well as the divisions between recognized subspecies, species, and population groups. [9]
The human population exploits a large number of other animal species for food, both of domesticated livestock species in animal husbandry and, mainly at sea, by hunting wild species. [ 164 ] [ 165 ] Marine fish of many species are caught commercially for food.
Common name Binomial name Population Status Trend Notes Image Hainan black crested gibbon: Nomascus hainanus: 20–50 [1]: CR [1] [1]Population was estimated at over 2,000 in the late 1950s.
Most species do not have population estimates, though the roe deer has a population size of approximately 15 million, while several are considered endangered or critically endangered with populations as low as 200.