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Docodonta(class Mammalia, subclass Prototheria) An extinct order of primitive mammals, known only from teeth found in Upper Jurassic rocks. Their brains may have been larger than those of reptiles; probably their young were fed with milk; possibly they were homoiotherms; and perhaps they were insectivorous, arboreal, and nocturnal. They were about the size of, and must have resembled, shrews.