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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Clydach Terrace, in Ynysybwl, Rhondda Cynon Taf, has a "unique risk of significant flooding" from the nearby Nant Clydach stream. It was under water during Storms Dennis and Bert, with homes extensively damaged.