Crossword Genius

What humans, horses and hamsters all are (7)

Ross

I believe the answer is:

mammals

(Other definitions for mammals that I've seen before include "Animals nourished with mother's milk" , "Animals that suckle their young" , "Class of animals" , "Warm-blooded vertebrates" , "Warm-blooded vertebrate animals" .)

I've seen this clue in the USA Today.
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