Orginal Publication Date
MCV/Q, Medical College of Virginia Quarterly
The mammals are an ancient division of the animal kingdom. They probably developed from reptile-like creatures in the early Triassic period, about 200 million years ago. Ever since then they have been changing to meet different and varying conditions of climate, enemies, and many other factors. Of the more than one million animals known in the entire animal kingdom, the 4,000 or so species of mammals represent a small minority.
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