Gorgo

A large, black eagle, that was found in an empty nest by Akka, years ago. She raised him and taught him how to survive by eating fish, rather than preying on animals, such as geese. Nils saved Gorgo from a zoo. Nils, Carrot and Gorgo flew the last bit together to Lappland. Unfortunately, Gorgo had to stay in Lappland when the wild geese wanted to leave Lappland when winter came again.

(Source: Wikipedia)