Domestic chickens are not capable of
long distance flight, although lighter birds are
generally capable of flying for short distances,
such as over fences or into trees (where they would
naturally roost). Chickens may occasionally fly
briefly to explore their surroundings, but generally
do so only to flee perceived danger.
Chickens are gregarious birds and live together in flocks. They have a communal approach to the incubation of eggs and raising of young. Individual chickens in a flock will dominate others, establishing a "pecking order", with dominant individuals having priority for food access and nesting locations. Removing hens or roosters from a flock causes a temporary disruption to this social order until a new pecking order is established. Adding hens—especially younger birds—to an existing flock can lead to violence and injury. This information was taken from http://Wikipedia.org
