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The sheer scale of this colony is hard to grasp. Most of the adult penguins are out fishing, so the majority you see here are the brown juveniles. As you can see, the colony extends a significant way up the glacier to the right!
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I love the comedic nature of this image, but also the textures captured in the water by the very high shutter speed used as the gentoo penguin re-enters the water while porpoising.