Conventional battery cages that were banned in the EU in 2012 remain legal and widely used across Asia, the Americas, and much of the developing world, confining billions of hens in conditions causing severe welfare harm.
Battery cage hens are unable to perform any of the behaviors central to normal chicken life — wing spreading, dustbathing, perching, nesting. The spatial restriction is so extreme that normal locomotion is impossible. Bone fractures from calcium loss affect the majority of laying hens over the course of their careers. The scale of battery cage egg production represents one of the largest ongoing animal welfare problems by individual count globally.