What Is the Opposite of Mammal?


Since mammals are vertebrate animals, the opposite of mammals would be the invertebrate animals such as molluscs, worms and insects. Mammals are members of class Mammalia; the air-breathing vertebrate animals that mainly feed their young on mother's milk.
Q&A Related to "What Is the Opposite of Mammal"
There is no "opposite" of mammals, only different life forms, such as reptiles (cold-blooded, egg-laying) or insects (very dissimilar) or bacteria (not multicellular) Mammal
Mammal is a classification, within a group of many other classifications, with
A placental mammal is one having a placenta. This excludes monotremes or marsupials, pouched mammals.
Mammals nurse their young with milk (mammary glands, etc.) and the opposites do not (insects, birds that lay eggs, fish, lizards, etc.).
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