Our American friends introduced us to this. It's a children's book by writer and illustrator Sandra Boynton. It's also a song - as are a lot of her books. Actually it's a pretty neat exercise in cross-marketing; the books are gorgeous, the songs quirky and sung by a vast array of interesting people, but that's all beside the point.
This song, however Personal Penguin has seriously got into my head. Toby loves it - he dances - so it's on high rotation in our house at the moment. It's fun, cute, and sung by Davey Jones (of the Monkees fame). Also, for what it's worth, it's something of a tribute to that perennial piano duet Blue Moon.
It's also possibly the most effective earworm I've ever come across. It's been going around in my head for days. (Displacing Elton John's Benny and the Jets, the previous resident...)
So be careful when (if!) you decide to hit play. I'll leave the decision up to you...