The Rockhopper penguin, Eudyptes chrysocome , is a small, aggressive, crested penguin . Although these flightless birds used to be hunted for their oil, they are now protected. They have a life span of over 10 years.
Penguins have shiny, waterproof feathers that help keep their skin dry.
Each year, penguins molt, losing their old feathers and growing new ones. Males and females are very similar in appearance. Their webbed feet are used for swimming. Rockhopper penguins live on sub- Antarctic islands . Their diet consists mostly of crustaceans and small fish.