 Not only does Steve Irwin provide the voice for one of the elephant  seals, but he was also originally cast to play an albatross that  Mumble encounters as he crosses the ocean after the aliens. The  albatross scene was cut from the final movie, but you can see it in  the DVD extras. The scene was cut before animation was complete, so  no actual animation existed until they were preparing the DVD for  release. The director and the production crew felt that they needed  to do something following Steve Irwins death, so they completed the  scene and included in the DVD in remembrance of him.