According to the Louisiana Rural Water Association, it takes up to 120 gallons of water to produce just one egg. They have enough space to move around and spread their wings. They can socialize and perform such natural behaviors as scratching at the ground and taking dustbaths. Laying hens have a well developed nervous system and are sensitive to touch, temperature and pain. Even their beaks have nerve tissue and pain receptors.
Chickens have excellent vision.
They see a color range similar to that of humans and a field of 300 degrees. Adult chickens can recognize and remember about 100 other chickens depending primarily on features of the head and neck. At night, chickens like to roost in trees. Chickens keep very clean by taking baths in the dust. The sand and other fine materials move through their feathers removing oil build-up and keeping them clean and fluffy.