Crossword Genius

Ancestors of two pairs of animals, I hear (9)

Ross

I believe the answer is:

forebears

I'm a little stuck... Click here to teach me more about this clue!

'ancestors' is the definition.
(forebear is a kind of ancestor)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for forebears that I've seen before include "Antecedents" , "Ancestors" .)

I've seen this clue in The Hindu.
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