MAMMARY • FREE-TRANSLATOR.COM • Definition of Mammary

... Carnivora. But the Mammalia offer a still more remarkable illustration of the fallacy of this mode of reasoning, for if there is one character more than another which is essential and distinctive of the class, it is that from which it derives its name, the possession of mammary glands and the power of suckling the young. What more reasonable, apparently, than to argue that the group in which this important function is most developed, that in which the young are most dependent upon it, and for the longest period, must be the highest in the Mammalian scale ...

— Contributions to the Theory of Natural Selection - A Series of Essays • Alfred Russel Wallace