What is "chinstrap penguin"

n. A species of penguin, ''Pygoscelis antarcticus'', with a distinctive black strip under their heads.

The chinstrap penguin (Pygoscelis antarctica) is a species of penguin which inhabits a variety of islands and shores in the Southern Pacific and the Antarctic Ocean. Its name derives from the narrow black band under its head which makes it appear as if it were wearing a black helmet, making it one of the most easily identified types of penguin. Other common names are "ringed penguin", "bearded penguin", and "stonecracker penguin" due to its harsh call.