Direct Action Everywhere, an all-volunteer animal advocacy group, released a video of a stealth visit to a cage-free barn in California that produces eggs sold at Costco under its private label brand, Kirkland. The video shows dead birds on the floor and injured hens pecked by other chickens. One bird had a piece of flesh hanging off its beak. The video focuses on a hen that Direct Action rescued and named Ella. When the organization found her in the cage-free barn, she was struggling to pull herself up and had lost most of her feathers. Her back was covered in feces. “There were birds rotting on the floor, and there was one dead bird that seemed to have lost her head,” said Wayne Hsiung, who helped make the video for the group, which is better known as DxE. “There were birds attacking birds, and the smell was horrible.” The egg industry has long warned that hens living cage-free in aviary systems will experience higher mortality rates and more disease. Research by the Coalition for Sustainable Egg Supply, which is financed by egg producers and food companies, found “substantially worse” levels of aggression and cannibalism in cage-free systems, also known as aviary systems, compared with caged systems. It has also found more damage to the birds’ sternum. “Consumers have an idyllic vision of what cage-free farming looks like,” Mr. Hsiung said. “They need to be shown the truth, which is that cage-free is far from humane.”