Rockhopper penguins live in steep, rocky places. The only way they can get around on land is to hop from rock to rock. Rockhoppers grow about 46 cm tall - almost as high as an adult's knee. They are the smallest of the crested penguins....

The sixteen different species of penguin are outlined and described in this website. They are also sub-divided into 6 different genera. Good information including images of each species can be found here.