Mumble is a penguin who doesn't fit in with the rest of his breed. They all sing their "heart song" but he just can't hold a tune, he does however have the ability to tap dance. His differences see him ostracised from his group and blamed for the lack of fish in the ocean. He leaves and meets up with a cool bunch of Adele penguins, who also dance and they set off to meet the humans responsible for overfishing the waters so they can see the error of their ways.
Mumble eventually gets captured and placed in an aquarium but eventually manages to lead a group of conservationists to the ice floes and hopefully to a realisation that mankind is having an adverse effect on wildlife.
It's a great movie from a conservationist viewpoint, it also highlights the need to let individuals be themselves and not necessarily conform to the rest of the group. The sound track is good and the animation stunning. I can't recall ever enjoying a film more tbh and my kids loved it too.