Tim writes: this is a Gentoo Penguin photographed at Neko Harbour on the Antarctic peninsula. This far south the place is full of snow and ice, but penguins usually climb to bare ground at the top of hills to nest as most species will not nest on snow. The two main reasons for this seemingly unnecessary trek are avalanches and tsunamis. We saw several avalanches while we were there, and anything nesting below a slope would be a risk. But what about tsunamis? Well these are mini tsunamis caused by calving glaciers which render the ice-free beaches unsuitable for nesting. We were told to run to high ground if we heard the cracking of a glacier.
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