Furnished or enriched cages replaced conventional battery cages in the EU but still restrict natural behaviors for billions of laying hens worldwide.
Furnished cages allow slightly more space and basic behavioral expression but still prevent flight, full wing extension, and complex social navigation. Perches at inadequate heights and nest boxes shared among too many hens create competition and stress. Bone fractures from osteoporosis caused by calcium depletion for egg production affect hens in all systems. Cage-free systems reduce some restrictions but introduce risks of aggression, disease, and smothering in large flocks without good management.