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Seals basking on new pancake floe off Cape Evans, Ross Island, in the Ross Dependency of Antarctica, during Captain Robert Falcon Scott's Terra Nova Expedition to the Antarctic, 7th March 1911. (Photo by Herbert Ponting/Scott Polar Research Institute, University of Cambridge/Getty Images)

Seals basking on new pancake floe off Cape Evans, Ross Island, in the Ross Dependency of Antarctica, during Captain Robert Falcon Scott's Terra Nova Expedition to the Antarctic, 7th March 1911. (Photo by Herbert Ponting/Scott Polar Research Institute, University of Cambridge/Getty Images)