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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 .
This is a collection of lists of mammal species by the estimated global population, divided by orders. Lists only exist for some orders; for example, the most diverse order - rodents - is missing. Much of the data in these lists were created by the International Union for Conservation of Nature (IUCN) Global Mammal Assessment Team, which ...
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. [1] Eastern black crested gibbon: Nomascus nasutus: 45–47 [2] CR [2] [2] Previously thought to be possibly extinct. Numbers may be higher. [2] Cat Ba langur
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 (IUCN SSC), along with the Zoological Society of London . [ 2 ]
The mosquito is the single deadliest, most dangerous animal in the world and also one of the smallest. Mosquitoes are estimated to cause between 750,000 and one million human deaths per year.
Range maps are provided wherever possible; if a range map is not available, a description of the crocodilian's range is provided. Ranges are based on the IUCN red list for that species unless otherwise noted. All extinct species or subspecies listed alongside extant species went extinct after 1500 CE, and are indicated by a dagger symbol ...
1. ^ Amount of quantified species contained in the list as of the "Retrieved" date in the corresponding citation. The amount of species in each order is according to the IUCN and BirdLife International; bird taxonomy is currently in flux and these figures may soon change. 2. ^ Preliminary estimate. 3. ^ Mature only.