A chicken coop (or hen house) is a building where female chickens are kept. Inside hen houses are often nest boxes for egg-laying and perches on which the birds can sleep, although coops for meat birds seldom have either of these features.
A coop may have an outdoor run. Both the inside and outdoor floors of a chicken coop are often strewn with a loose material such as straw or wood chips to deal with chicken droppings and to allow for easier cleanup. Most chicken coops have some means of ventilation to help air out any smells.
Housing controversies 
There is a long standing controversy over the basic need for a chicken coop. One philosophy, known as the "fresh air school" is that chickens are mostly hardy but can be brought low by confinement, poor air quality and darkness, hence the need for a highly ventilated or open-sided coop with conditions more like the outdoors, even in winter. However, others who keep chickens believe they are prone to illness in outdoor weather and need a controlled-environment coop. This has led to two housing designs for chickens: Fresh-air houses with wide openings and nothing more than wire mesh between chickens and the weather (even in Northern winters), or closed houses with doors, windows and hatches which can shut off most ventilation.
Backyard coops 
Backyard coops are small and often enclosed within a fenced area (sometimes bounded by chicken wire) thus creating a more natural living environment, one in which the chickens cannot only roam freely but also peck and hunt for insects. If this kind of "yarding" is both floorless and reasonably mobile it is called a chicken tractor. Many people, especially those in rural areas, keep a small flock of chickens for themselves from which they harvest both eggs and meat.
The number of small chicken coops in urban areas has been growing, which has led to the marketing of manufactured chicken coops, such as Eglu, which are designed for more cramped spaces and a tidier look. Manufactured chicken coops are primarily marketed towards urban chicken coop owners and are often more expensive than building one's own chicken coop.
Urban settings may have laws which regulate any backyard farming of livestock. For example, Oakland, California bans roosters and has a rule stating that hens must be kept at least twenty feet away from dwellings, schools and churches.
Other uses 
- In American English the slang phrase flew the coop means someone who has fled before being sent to jail ("The police had a warrant for his arrest, so he flew the coop!").
- American truckers call weigh stations chicken coops.
- In the poem Ballad of John Silver by John Masefield there is a reference to drowning merchants "lamenting the absent chicken coop". In the age of sail, vessels on long voyages would often keep live poultry for meat and eggs within wooden coops stacked on deck. If a ship should sink or capsize these coops would typically come loose and float freely, making for an impromptu emergency floatation device. This maritime usage is archaic and may now be lost.
- A type of Soviet early warning radar were called Hen House by NATO.
See also 
- Woods, Prince T. (October 2008). "Fresh-Air Poultry Houses". Norton Creek Press. Retrieved 18 April 2012.
- North and Bell, "Commercial Chicken Production Manual", 5th ed. Van Nostrand Reinhold, 1990, p 189.
- "Deciding On Your Chicken Coop". Chicken Coops and Plans. Retrieved 18 April 2012.
- "Animal Services". City of Oakland Animal Services. Retrieved 18 April 2012.
- Skinner, Katy. "Chicken Laws". TheCityChicken.com. Retrieved 18 April 2012.
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