Au fil des siècles, on est ________ des prédateurs. Why is the answer " resté "

Question

and not " restés ", "On" in this question implies that "we" the humans, which is plural.

Accepted Answer

Yes, but unless it is a personal "we" (as in me, my wife and the kids) you don't use the plural. 
 
On est allés en vacances. -- We went on vacation. 
On est allé à la lune. -- We went to the moon (we=humanity. )
 
-- Chis (not a native speaker).

Answer

I believe I understand the general principle. However, in the sentence given by stephen it seems contradictory to me that it then goes on with a plural "des prédateurs". To me this indicates that the "on" is a real plural and the participle should be "restés".

Answer

no matter, Almut. The impersonal "on" will always take the participle in singular to distinguish it from the more personal "on" meaning "we".

Answer

P