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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.
Also called an antibacterial. A type of antimicrobial drug used in the treatment and prevention of bacterial infections. Archaea One of the three recognized domains of organisms, the other two being Bacteria and Eukaryota. artificial selection Also called selective breeding. The process by which humans use animal breeding and plant breeding to selectively control the development of particular ...
Small mammals or micromammals are a subdivision of mammals based on their body mass and size. Different values have been used as the upper limit. Different values have been used as the upper limit. The International Biological Programme has defined small mammals as species weighing up to 5 kg.
It has been suggested that the increasing thickness of avian eggshells in proportion to egg mass with increasing egg size places an upper limit on the size of birds. [ 26 ] [ note 1 ] The largest species of Dromornis , D. stirtoni , may have gone extinct after it attained the maximum avian body mass and was then outcompeted by marsupial ...
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 ...
Pages in category "Animal size" The following 17 pages are in this category, out of 17 total. This list may not reflect recent changes. B. Bergmann's rule; C.
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The hippopotamus is a megaherbivore and is exceeded in size among land animals only by elephants and some rhinoceros species. The mean adult weight is around 1,480 kg (3,260 lb) for bulls and 1,365 kg (3,009 lb) for cows. Exceptionally large males have been recorded reaching 2,660 kg (5,860 lb). [30]