two examples that you may already have seen
hero dog rescues other dog from Chilean motorway
fully grown lion remembers his human owners and greets them
questions?
How did dog know his mate was in trouble?
How did dog know to drag him out of way of traffic?
Why did dog risk his own life (if indeed he thought he was risking his life) to help mate?
How did Christian remember his human owners having not seen them in so long?
Were his owners not scared that
a) he might not remember them?
b) even if he did remember them, maybe he might get too enthusiastic during the reunion and injure them?
How can a wild animal create such a bond with a different species of creature?