Ricky "The Rockhopper" is a rockhopper penguin living at the ZSL London Zoo. Rockhoppers are distinguished by the irreverent crest of spiky yellow and black feathers that adorn their heads. They are among the world's smallest penguins, standing about 20 inches tall. Not everyone has the chance to jet off to London and meet Ricky personally (but if you do, you should). Lucky for those of you, he's on Facebook!