An illustration comparing the giant penguin to an average person. Kumimanu biceae weighed about 220 pounds and was a bit shorter than 6 feet in height. It swam around off the coast of New Zealand between 55 and 60 million years ago.
Forage fish like these at a Chilean processing plant are often used for fish meal used in aquaculture. But critics consider this inefficient and wasteful and worry it could deplete fish populations. Now several companies are developing protein substitutes to replace fish meal.
Julio Etchart/ullstein bild via Getty Images
Sale Tambaya, a cattle herder in central Nigeria, grazes his cows. After his home state criminalized open grazing on Nov. 1, he and his family fled with their livestock to a neighboring state where grazing is allowed. Two of his sons died on the journey.
Tim McDonnell for NPR
Black-footed ferrets are the most endangered mammal in North America. Scientists in Montana are trying to save the ferrets by saving their main food source, prairie dogs.
Kathryn Scott Osler/Denver Post via Getty Images
Grass-fed, antibiotic-free cattle gather at a farm in Yamhill, Ore. For the first time, government statistics show America's pigs, cattle and poultry are getting fewer antibiotic drugs.
A peregrine falcon in Germany. A new study finds the birds are able to dive at high speeds and catch moving prey using a mathematical principle that also guides missiles.
Sebastian Willnow/AFP/Getty Images