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Chinstrap penguins arrive in colonies October/November with egg laying occurring November/December. Females may arrive on average 5 days later than their male partners. Both fast at the colony until egg laying. This can vary from about 2-3 weeks depending upon the location. Clutch size is usually two with a laying interval of 3.2 days. Females most often take the first incubation shifts, and the first four shifts average 5 – 10 days each. Incubation periods average 36 days for first eggs and 34 days for second eggs. Chicks crèche at 23-29 days and fledge at 52-60 days.
Chinstrap penguins feed almost exclusively on krill (Euphasia superba). Other crustaceans and fish play a minor role.