The Chinstrap Penguin is a circumpolar species that breeds on widely dispersed islands throughout the sub-Antarctic. The highest concentration of these breeding localities is the South Atlantic where the species breeds on the South Georgia, South Orkney, South Shetland, and South Sandwich Islands. Due to a recent population explosion of krill, the Chinstraps’ main food source, the Chinstrap is fast becoming one of the most numerous penguin species, second only to Macaroni Penguin. From mainland South America, this species is most easily seen off the coast of southern Argentina and Tierra del Fuego where it occurs in the Austral winter. The Chinstrap Penguin is best identified by its white face and black bill rather than the chinstrap, which is potentially difficult to see in the field.