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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 .
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In zoology, megafauna (from Greek μέγας megas "large" and Neo-Latin fauna "animal life") are large animals. The most common thresholds to be a megafauna are weighing over 46 kilograms (100 lb) [2] [3] [4] (i.e., having a mass comparable to or larger than a human) or weighing over a tonne, 1,000 kilograms (2,205 lb) [2] [5] [6] (i.e ...
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 ]
List of individual apes; Oldest hominids; 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; List of individual bovines; List of individual cetaceans. List of ...
These species which we see today are only the smallest part of those which a blind destiny produced." 1748. John Tuberville Needham, an English naturalist, wrote Observations upon the Generation, Composition, and Decomposition of Animal and Vegetable Substances in which he offers "proof" of spontaneous generation. Needham found flasks of broth ...
Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000 ...
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]