Pygoscelis adeliae
Adélie Penguin colonies leave broad guano stains on exposed Antarctic ground and rock. Researchers can locate and measure those stains in satellite imagery, then use drones and field surveys to turn a colorful smudge into a defensible population estimate.
A comprehensive Danger Islands survey estimated 751,527 nesting pairs—about 1.5 million breeding adults—and increased the known regional abundance enough to change estimates of krill demand and the case for marine protection.
*The colonies were not wholly unknown. Satellite imagery revealed that this remote and poorly surveyed hotspot was vastly larger than recognized.
See the fieldwork, meet the researchers, or support bird science.
Open the Danger Islands study ↗Links go directly to conservation organizations.Satellite + drone + field survey.
The Danger Islands work combined Landsat classification, high-resolution commercial imagery, drone mosaics, ground counts, and historic aerial photographs.
That layered method matters: stain area is an excellent clue, but researchers still validate what the satellite sees before quoting a colony number.
Inspect the survey methods ↗