Crossword Genius

The hare, but not the tortoise

Ross

I believe the answer is:

mammal

(Other definitions for mammal that I've seen before include "Live-young animal" , "Milk-secreting animal" , ".Animal of class that suckles its young" , "Whale, for example" , "It's young are nourished by milk" .)

I've seen this clue in The New York Times.
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