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2. Chick raising ability in Adelie penguins.;Ainley;Auk,1972
3. Notes on the habits of the Gentoo and Ringed or Antarctic penguins.;Bagshawe;Trans. Zool. Soc. London,,1938
4. Adaptive significance of the nestling period of Guillemots Vrlaaalge.;Birkhead;Trans. Zool. Soc. London,,1977