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Great physical changes have taken place in animals domesticated. Now they differ considerably in colour, form, size, etc. from their related wild forms. Great experience has been gained in improving stocks by the scientists, using selection, crossbreeding and inbreeding.
Some possibilities for domestication may still exist. Perhaps fur-bearing animals, such as mink and foxes are now being domesticated in the same slow way as cattle and sheep were many thousand years ago.
The origin of domestication is unknown.
Domestication of animals is more than taming.
Domestication of cattle has had varying degrees of success, from half-wild buffaloes to the tame British Jersey.
Now they differ considerably in colour, form, size, etc. from their related wild forms.