Adelie Procession (#4 in a Sequence) showing a group of Adelie Penguins (pygoscelis adeliae) gathering together to cross a frozen pool in the pressure ridges in the sea ice at Cape Hallett, Ross Sea, Antarctica.
Canon EOS, zoom lens.
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Because this frozen pool was different from the regular environment they were very diffident about crossing it. It was as if they thought it was open water, rather than frozen, and that the risk of a Leopard Seal may have been present. Once they did get going they hurried across, skidding and sliding as well as running.
Global warming has not yet had any devastating effects on Antarctica, but the signs are there with larger and more icebergs being carved meaning that more fresh water is being deposited into the ocean.