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Bird, frog, and fish,
What are Mammals?
Mammals like you and I (I'm assuming you're not a fish, bird, or frog), are a class of animals that are characterized by their ability to produce milk for their young, the need to breathe air, fur covered bodies, and spinal cords (of course mammals share other similarities as well).
Almost all mammals have live births (the monotremes such as the platypus are an exception).
The frog, fish, and bird in this poem belong to other classes in the animal kingdom.