Strange Companions (1983)

This is about a runaway orphan boy and a man at the end of his rope financially who is a pilot that studies migrating animals. The boy stole away on the plane and while the man was looking for migrating Whooping Cranes had mechanical difficulties and crash landed in a remote area of Canada. After crash landing they find egg, hatch it, and the three together brave the elements to try to make it back to civilization.