Macaroni penguins spend the winter at sea and return to colonies on land during the austral spring to reproduce. Arrival weights of male and female Macaroni penguins on Bird Island, South Georgia have been monitored since 1988. The current protocol is that 50 males are weighed on 28th October and 50 females on 8th November.
Bird Island, Eudyptes chrysolophus, Macaroni penguin, arrival mass
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