Abstract There has been a long-standing debate about the post-hatching mode of development of the Great Auk’s Pinguinus impennis single chick. Did it show an ‘intermediate’ pattern, leaving the colony at around one quarter of the adult’s weight like its closest relatives the Razorbill Alca torda, Common Guillemot Uria aalge and Brünnich’s Guillemot&nbs
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