Answer:
I believe the answer would be Squirrels
Step-by-step explanation:
An antecedent is a thing or event that exists before. In terms of English sentence, its part of a sentence that is later replaced by a pronoun. A common example would be the word "Mark" in the sentence Mark loves his bike
So, taking from that, it would be the general subject that is later referred to as a pronoun. In this case, that would be Squirrels, as it is later in the sentence referred to as their