Which penguin genus contains the chinstrap, gentoo, and Adélie penguins?

The chinstrap, gentoo, and Adélie penguins belong to the genus Pygoscelis.

Pygoscelis is a genus of three living penguin species: the Adélie penguin, the chinstrap penguin, and the gentoo penguin. The name is derived from Greek words associated with the rump or tail and the leg, reflecting the birds’ body form.

These penguins are generally associated with the Southern Ocean and Antarctic or subantarctic environments. They share several features, including relatively upright body posture and strong adaptation to swimming. Their exact ranges and breeding habitats differ: Adélie penguins are strongly associated with Antarctica, while chinstrap and gentoo penguins also occur on subantarctic islands.

Pygoscelis is sometimes confused with Aptenodytes, the genus containing emperor and king penguins. The genera are separate evolutionary groups. Scientific genera are useful for showing relationships, but they do not mean that all members have identical behavior, size, or geographic range.