A peril of living on sea-ice is that it's only
temporarily stable, sooner or later it starts to break up. This
crack is caused by the small changes resulting from the rise and fall
of the tide causing the ice to part and meet again. Eventually, these
tide cracks will help the ice break up in the spring and summer and
move out. Hopefully these penguins will have fledged by then and be
safely out at sea feeding.
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This picture by Jerome Maison. © 2005 Bonne Pioche
Productions / Alliance De Production Cinematographique.
Warner Brothers film The March of the Penguins used here by permission
Warner Bros - March of the
Picture book of the movie