How This Supercolony of 1.5 Million Penguins Stayed Hidden for Nearly 3,000 Years

This year, scientists announced an incredible discovery by looking at poop stains in satellite images — 1.5 million Adélie penguins were living and thriving on a little patch in Antarctica surrounded by treacherous sea ice called the Danger Islands. It all started when a group of researchers spent 10 months doing what they thought was a pan-Antarctic survey of Adélie penguins by looking through every single cloud-free satellite image that they had of the southern continent.