The rockhopper penguins are three closely related taxa of crested penguins that have been traditionally treated as a single species and are sometimes split into two or three species. Not all experts agree on the classification of these penguins. Some consider all three as distinct species, some split the western and eastern forms into the southern...
Found on
http://en.wikipedia.org/wiki/Rockhopper_penguin
(from the article `penguin`) ...are much more awkward, even amusing, as they rock from side to side as they walk. Despite their short legs, however, penguins can run with ...
Found on
http://www.britannica.com/eb/a-z/r/59
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