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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]
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 consists of 1700 mammalogists from over 130 countries. They recognize 5488 species in the class. [1] [2]
Krill are just a few centimetres long fully grown, but are one of the most abundant animals on Earth [WWF] ... Krill are food for some of the largest animals on the planet - including giant whales ...
The most endangered pinniped. Cozumel raccoon: Procyon pygmaeus: 323–955 [8] CR [8] [8] Mature individuals number less than 250. Populations can be severely affected by hurricanes. [8] Ethiopian wolf: Canis simensis: 500 [9] EN [9] [9] One of the world's rarest canids, and Africa's most endangered carnivore. Siberian tiger: Panthera tigris ...
The dog is the most widely abundant large carnivoran living in the human environment. [149] [150] In 2020, the estimated global dog population was between 700 million and 1 billion. [151] In the same year, a study found the dog to be the most popular pet in the United States, as they were present in 34 out of every 100 homes. [5]
A study analyzed the DNA of feral dogs living near Chernobyl, compared the animals to others living 10 miles away, and found remarkable differences.
One of the 25 most endangered primates. [7] Delacour's langur: Trachypithecus delacouri: 234–275 [8] CR [8] [8] The population of the species has radically decreased over the past decade. [8] Silky sifaka: Propithecus candidus: 250 [9] CR [9] [9] Estimate is believed to be a maximum. [9] Tonkin snub-nosed monkey: Rhinopithecus avunculus: 250 ...
He also notes that humans can be just as good (and for some dogs, better) social partners for their pets — every animal is unique, and not all dogs enjoy the company of their peers.