Adélie penguin colonies can be seen from space because their guano is so large and bright. Researchers analyzed about 4,000 Landsat satellite images, dating back to the 1980s, to read the color of that guano. Krill have a pink exoskeleton that penguins don't fully digest, so guano from krill-heavy diets is pinker than guano from fish-heavy diets. The team collected guano samples, measured their color with a spectrometer, and identified what the birds had eaten, which let them link satellite colors to diet. The results show that when sea ice is abundant, Adélie penguins eat more small fish, and when it is scarce they rely more on krill. Colonies that eat more fish tend to hold steady or grow, while those that eat less fish have declined across much of the species' range.

Hampi is a UNESCO World Heritage Site in Karnataka, India, with more than 1,600 surviving remains spread over 4,100 hectares. It was the capital of the Vijayanagara Empire from 1336 to 1565. Travellers from Persia and Portugal described it as a prosperous, wealthy and grand city with temples, markets and farms along the Tungabhadra River. By 1500 it was estimated to be the world's second-largest city after Beijing, and probably India's richest at the time. In 1565 a coalition of Muslim sultanates defeated the Vijayanagara Empire, its capital was conquered and destroyed, and the city was left in ruins. Hampi remains a religious centre, with the active Virupaksha Temple at its heart.