Perching is a fundamental behavioural need for laying hens, reflecting their evolution as tree-roosting birds. Providing appropriate perch access is a key welfare indicator in commercial systems.
The motivation to perch is deeply embedded in hen biology — it is a roosting behaviour that in wild ancestors provided protection from ground predators. Hens deprived of perches experience chronic frustration of a powerful motivational system. In enriched colony cages, perch provision is legally required but often insufficient: too little space for all hens to perch simultaneously means that subordinate individuals are denied access. Barn and free range systems with adequate perch provision and height allow hens to satisfy this need fully. Perch use is also a health behaviour — hens that perch at night reduce contact with contaminated litter, lowering footpad injury risk.