Hump-Backed Shrimp
Hump-Backed Shrimps look like they belong in the tropics. That's because they do. But occassionally one gets caught up in the East Australian Current and ends up in Mosman.
They could have easily made the film Finding Nemo about a Hump-Backed Shrimp rather than a clownfish, but we don't think 'Finding Henry' would have been such a box office success.