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/ˈmæməl/ · noun
A vertebrate animal of the class Mammalia, characterized by being warm-blooded, having fur or hair and producing milk with which to feed their young..
Use mammal when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Mammal means A vertebrate animal of the class Mammalia, characterized by being warm-blooded, having fur or hair and producing milk with which to feed their young..
Common synonyms include mammal, mammalian.
The opposite depends on the specific sense.
Use mammal where its definition matches the intended context.
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