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In honor of this year’s Penguin Awareness day, the British Antarctic Survey announced the existence of a previously undiscovered emperor penguin colony in one of the most remote and inaccessible parts of Antarctica. Scientists spotted the colony, the 66th to be found on the continent, by comparing satellite imagery captured by the European Space Agency’s Copernicus Sentinel-2 mission and Maxar’s WorldView-3 satellite.

The photo you see below is the one that led the British Antarctic Survey to the colony. The brown stains that contrast against the stark white ice and snow of the Verleger Point in West Antarctica are the accumulated “guano” droppings seabirds like emperor penguins leave behind when they need to relieve themselves. For the last 15 years, the British Antarctic Survey has been searching for new penguin colonies by using satellite imagery to spot the tell-tale poo stains. Of the 66 colonies humans know about in Antarctica, exactly half have been found using satellites.