They nest in bare open grounds in the south. The nests are made of stone, mosses, and seaweed. They may share colonies with Chinstraps and Adelie penguins. They often return to the same colony year after year. The female penguin, that is called a hen, lays two eggs several days apart.
Incubation lasts thirty-six days.
Some other information is that of Chinstrap and Adelie penguins Gentoos are among smaller species. Other than the Emperor and King penguins Gentoos are the third largest penguin. Gentoos will temporarily leave if they are threatened or disturbed. The average size of an Albatross or a Petrel's wingspan is 36-122 cm. Some larger species of Albatross or Petrels have wingspans up to 3 meters long.