"One if by land, two if by sea!" Coined by Longfellow, in his poem about the iconic ride of Paul Revere, the warning referenced how many more British troops could attack by sea versus land. Coincidentally enough, in the natural world it appears that the Loggerhead sea turtles outnumber the Galápagos land tortoises.
Believe it or not, scientists are using satellite images of penguin poop, or guano, to study changes in penguin populations and climate change. While the images cannot show individual penguins, they can show the large areas of guano left around nesting areas. It is the color of the poop that is of particular importance to scientists because that tells the story of what the penguins have had available to feed on.