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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 .
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.
He was a vegetarian, and was reportedly the first animal "liberationist", buying animals from the market in order to set them free. [ 3 ] [ 5 ] Against these ideas, Aristotle (384–322 BCE) argued that non-human animals had no interests of their own, ranking far below humans in the Great Chain of Being , or scala naturae , because of their ...
The African bush elephant (foreground), Earth's largest extant land animal, and the Masai ostrich (background), one of Earth's largest extant birds. In zoology, megafauna (from Greek μέγας megas "large" and Neo-Latin fauna "animal life") are large animals. The precise definition of the term varies widely, though a common threshold is ...
Nearly all modern animal phyla became clearly established in the fossil record as marine species during the Cambrian explosion, which began around 539 million years ago (Mya), and most classes during the Ordovician radiation 485.4 Mya. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single ...
Goodall in 2009 with Lou Perrotti, who contributed to her book Hope for Animals and Their World Owing to an overflow of handwritten notes, photographs, and data piling up at Jane's home in Dar es Salaam in the mid-1990s, the Jane Goodall Institute's Center for Primate Studies was created at the University of Minnesota to house and organise this ...
Founder of the Animal Rights Network (ARN), the world's largest library on animal rights, which became the Animals and Society Institute. Author of Growl: Life Lessons, Hard Truths, and Bold Strategies from an Animal Advocate. Lantern Books, 2013. [154] Gary Steiner: United States John Howard Harris Professor of Philosophy at Bucknell ...