For me it would be the seals. If you saw the movie you would know why.
Reminds me of a novel I just read ... one of the superheroes, their only superpower was the ability to communicate with any animal. Wherever the person went, it was like an old Disney movie - with the animals "swarming" around them. LOL
Seriously, in any scenario where I could effectively communicate with animals, I would try to get them to "overthrow" humanity.
Wouldn't matter what the animal was.
The only types of animals I can think that might be offputting, would be carnivorous ones.
Especially ones that ate their partner after mating.
I imagine it would be like having a conversation with Hannibal Lector. {shudder}