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Animals may be bred, as well, to maintain captive populations and kept under veterinary care. These facilities include zoos , safari parks , animal theme parks , aviaries , butterfly zoos , reptile centers , and petting zoos , as well as wildlife sanctuaries and nature reserves where visitors are allowed.
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 .
Humans have introduced more different species to new environments than any single document can record. This list is generally for established species with truly wild populations— not kept domestically, that have been seen numerous times, and have breeding populations. While most introduced species can cause a negative impact to new ...
animal feed, racing, research, show, pets Tame, significant physical changes Common in the wild and in captivity 1d Rodentia: Fancy rat a.k.a. laboratory rat (Rattus norvegicus domestica) Brown rat (Rattus norvegicus) the 19th century CE [53] the United Kingdom: animal feed, research, show, pets Tame, some physical and psychological changes
By 1984 it was ranked among the ten worst zoos in the United States. Systematic reform by 2000 put it on the list of the ten best. [31] By 2020, the United States featured 230 accredited zoos and aquariums across 45 states, accommodating 800,000 animals, and 6,000 species out of which about 1,000 are endangered.
In the English language, many animals have different names depending on whether they are male, female, young, domesticated, or in groups. The best-known source of many English words used for collective groupings of animals is The Book of Saint Albans , an essay on hunting published in 1486 and attributed to Juliana Berners . [ 1 ]
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Animal welfare organizations are concerned with the health, safety and psychological wellness of individual animals. These organizations include animal rescue groups and wildlife rehabilitation centers, which care for animals in distress and sanctuaries , where animals are brought to live and be protected for the rest of their lives.