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Mammal - Wikipedia
Mammal | Definition, Characteristics, Classification, Examples,
MAMMALIAN中文(简体)翻译:剑桥词典 - Cambridge Dictionary
Characteristics of mammals | Britannica
Mammal - Classification, Class Mammalia, Monotremes, …
Mammals – Definition, Examples, Characteristics - Science Notes …
Mammal Pictures & Facts - National Geographic
MAMMAL中文(简体)翻译:剑桥词典 - Cambridge Dictionary
Mammals - Encyclopedia of Life
Mammalian Definition & Meaning - Merriam-Webster