Enriched colony cages replaced battery cages in the EU in 2012 but have themselves been criticized by welfare organizations. Understanding what enriched colonies provide and lack matters.
Enriched colony cages represent a welfare improvement over conventional battery cages but fall significantly short of what hens need to express their natural behavioral repertoire. The nest box and perch provided are improvements, but the space constraints still prevent dust-bathing, running, full wing-flapping, and normal foraging patterns. The welfare literature is clear that cage-free systems allow substantially better behavioral expression despite their own welfare challenges (feather pecking, air quality in barn systems). The rapid corporate commitment to cage-free sourcing in many global markets has created momentum for genuine welfare improvement, though implementation timelines are often extended and enforcement is inconsistent. The remaining challenge is ensuring that cage-free transitions deliver actual welfare improvements rather than nominal compliance.