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Domestication is a gradual process, so there is no precise moment in the history of a given species when it can be considered to have become fully domesticated. Zooarchaeology has identified three classes of animal domesticates: Pets (dogs, cats, ferrets, hamsters, etc.) Livestock (cattle, sheep, pigs, goats, etc.)
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 environments they reach, some can have a positive impact, just for conservation purpose.
The family Bovidae consists of 146 extant species belonging to 53 genera in 9 subfamilies and divided into hundreds of extant subspecies. This does not include hybrid species or extinct prehistoric species.
Rock, domestic, and feral pigeons are all the same species and will readily interbreed. [4] Many domestic birds have gotten lost, escaped or been released over the years, and these gave rise to populations of feral pigeons. Feral pigeons inhabit man-made structures such as buildings as a substitute for cliffs and other rock formations.
SEE ALSO: Meet the happiest animal on Earth. 14-30,000 BC: Dogs. 8500 BC: Sheep and Cats. 8000 BC: Goats. 7000 BC: Pigs and Cattle. 6000 BC: Chickens. Check out these furry animals: 5000 BC ...
Domestication has been defined as "a sustained multi-generational, mutualistic relationship in which one organism assumes a significant degree of influence over the reproduction and care of another organism in order to secure a more predictable supply of a resource of interest, and through which the partner organism gains advantage over individuals that remain outside this relationship ...
Reindeer herders have their own stories about how reindeer were domesticated, and about the relationship between wild and domestic reindeer. Whatever the debate, the very fact of domination of a reindeer led to a reindeer revolution that spread to the North, East, and West. Sleds pulled by reindeer appeared later than dog sleds.
Another example is of goats competing with cattle in Australia, or goats that degrade trees and vegetation in environmentally-stressed regions of Africa. Accidental crossbreeding by feral animals may result in harm to breeding programs of pedigreed animals; their presence may also excite domestic animals and push them to escape.
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