I have a bunch of Blue Jays around my house and it turns out they are so good at imitating a specific hawk species(blanking on its name) that Merlin actually reports it as the hawk! I went and listened to real recordings of that hawks call and I couldn't tell it apart from the Jays imitation call.

Now, I know it's technically possible it was a real id, but Im pretty sure the bald eagle it detected was actually one of the kids down the street running around screaming lol