Size and form have also been modified by domestication, the wild canary being not more than in.
A more or less close adaptation to local conditions is thus brought about, and breeds or races are produced which are sometimes liable to deterioration on removal even to a short distance in the same country, as in numerous cases quoted by C. Darwin (Animals and Plants under Domestication).
Domestication has changed the behavior and appearance of cats, but not their digestive systems.
They are docile in disposition, and thus well fitted for domestication.
C. Darwin collected a large number of cases in his Animals and Plants under Domestication.
