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On the Danger Islands of Antarctica, researchers have discovered one of the world’s largest colonies of Adélie penguins, harboring more than a million birds of a species long thought to be succumbing to changing weather patterns and dwindling food supplies. 
  
 The Adélies are dressed by nature in formal black and white. Their eyes are rimmed by distinctive white rings that resemble spectacles. And in recent decades, their fortunes have shifted with long-term changes in the annual ice conditions on which they depend, with eight... ||||| Media playback is unsupported on your device Media caption Largest population of penguins found in Antarctic Peninsula 
  
 Scientists have stumbled across a huge group of previously unknown Adélie penguins on the most northerly point of the Antarctic Peninsula. 
  
 Numbering more than 1.5 million birds, they were first noticed when great patches of their poo, or guano, showed up in pictures taken from space. 
  
 The animals are crammed on to a rocky archipelago called the Danger Islands. 
  
 The researchers, who detail the discovery in the journal Scientific Reports, say it is a total surprise. 
  
 "It's a classic case of finding something where no-one really looked! The Danger Islands are hard to reach, so people didn't really try that hard," team-member Dr Tom Hart from Oxford University, UK, told BBC News. 
  
 Image copyright T.S.McChord/H.Singh/NU/WHOI Image caption Drone pictures were one of the most efficient means of counting 
  
 The scientists used an algorithm to search images from the American Landsat spacecraft for sites of possible penguin activity. 
  
 Landsat does not return especially high-resolution pictures and so when the system flagged potential colonies, they had to be followed up with much sharper pictures for confirmation. 
  
 "And the sheer size of what we were looking at took our breath away," said Dr Heather Lynch from Stony Brook University, New York. 
  
 "We thought, 'Wow! If what we're seeing is true, these are going to be some of the largest Adélie penguin colonies in the world, and it's going to be well worth our while sending in an expedition to count them properly." 
  
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 Image copyright C.Youngflesh/SBU Image caption The drones flew grid lines over the penguin nests 
  
 But, as the name implies, the Danger Islands are notoriously difficult to reach. 
  
 Even in the austral summer, the ocean surrounding the archipelago is filled with the kind of thick sea-ice that ships try to avoid. 
  
 However, in December 2015, the team did manage to get on the ground to begin its count. And one of the most effective techniques was to deploy drones, which flew above the birds to make large mosaics of their nesting sites. 
  
 "The drone lets you fly in a grid over the island, taking pictures once per second. You can then stitch them together into a huge collage that shows the entire landmass in 2D and 3D," explained Prof Hanumant Singh from Northeastern University. 
  
 Image copyright T.HART/OXFORD Image caption These are dangerous waters - hence the name of the islands 
  
 Once again, trained software was called upon to do the actual counting. 
  
 The survey revealed that the Danger Islands host in total 751,527 pairs of Adélie penguins, including the third and fourth largest colonies in the world. 
  
 The result is of major significance because it would appear the archipelago has somehow avoided the recent Adélie declines documented elsewhere on the peninsula, particularly on its western side. 
  
 Scientists suspect that decline has something to do with reductions in sea-ice, which is an important habitat for krill, the small crustaceans that form a key part of the penguin diet. 
  
 Image copyright R.Herman/LSU/SBU Image caption Sea-ice is important to these birds because it is a recruitment habitat for krill 
  
 Dr Hart commented: "On the West Antarctic Peninsula, Adelie and chinstrap penguins are declining pretty fast, while Gentoo penguins are increasing. 
  
 "It's hard to know the causes. Clearly climate change and reduction in ice and krill play a part, but a decline in sea-ice also allows in shipping - fisheries in particular - which may exacerbate the problem. 
  
 "In the past we've looked at this on the West Antarctic Peninsula versus places like Elephant Island (further to the north). Finally getting into the Danger Islands and counting the penguins shows how robust populations are where the ice is intact." 
  
 And Dr Lynch added: "The other point worth making is that these islands are right in the mix for a couple of marine protected areas that are being proposed. 
  
 "Whether they'll be in or out, we don't know but at least now the people making those decisions will understand how important this area is," she told BBC News. 
  
 Dr Peter Fretwell from the British Antarctic Survey knows the team but was not involved in this study. He also uses satellites to identify and count animal groups. 
  
 "Despite our modern technologically advanced world there are still remote corners that we know very little about - usually because they are extremely difficult to get to," he said. 
  
 "Modern satellites are fantastic tools for exploring and studying these hard-to-access places. I am sure that there are many other natural discoveries to be made using these 'eyes in the sky'." 
  
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Output:
More than 1 million penguins who've been hiding in a remote part of Antarctica were recently discovered thanks to images taken from space and ... their own poop. A study in the Scientific Reports journal reveals the Danger Islands find of more than 750,000 pairs of Adélie penguins—a discovery researchers are calling a "total surprise," per the BBC. "It's a classic case of finding something where no one really looked," study co-author Tom Hart says. The detective work started in 2014, when satellite images taken from space showed enormous guano stains (guano being bird poop), per the Wall Street Journal. Those images spurred scientists to travel to the Danger Islands in 2015, where they realized the magnitude of their find. "I was amazed by the sheer number," study co-author Michael Polito says, per the Independent. "The water around the island boiled with penguins." They counted the penguins by hand and with a drone that flew overhead snapping photos. It's a significant number, as this colony doesn't seem to have been as affected by population decline as other colonies on the Antarctic Peninsula. Researchers believe other colonies may have been adversely affected by a reduction in sea ice from climate change—krill, tiny crustaceans that are a staple in the penguin diet, live in the ice—an influx of fishermen, and other human disturbances. Because the archipelago where this new colony is located is so remote, the penguins there may have been protected from some of these factors. This group may have been around for decades, too: The scientists went back to satellite images taken in the late 1950s and, based on that evidence, they believe the penguin population there has been stable since that time. (A "catastrophic" breeding event among another Adélie colony.)