The penguins' feathers are "the most complicated and best insulating of any animal", he says. Over time they are damaged, so the penguins shed them annually.
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Donald Campbell, advocacy director at Foxglove, a group of campaigning lawyers, said Miliband's letter to the committee "raises more questions than it answers".
Jack Dorsey lays off 4,000, says others will do same 'within the next year'