Abstract
1. 1. Penguins fast during the annual moult. Moulting macaroni penguins, Eudyptes chrysolophus, and rockhopper penguins, E. chrysocome, were analysed for protein, fat and water content. 2. 2. Fat reserves declined by 38g/day and were exhausted after 34 days in macaroni penguins. In rockhopper penguins fat reserves declined by 33g/day and were exhausted after 28 days. 3. 3. Energy consumption of moulting macaroni and rockhopper penguins was 387 kcal/day and 338 kcal/day respectively. 4. 4. Macaroni and rockhopper penguins would need to consume about 16kg and 11kg of crustaceans respectively in order to accumulate sufficient food reserves for moulting.
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