Building a Wildlife-Proof Chicken Coop
With people spending more time at home during COVID-19, 2020 has become a record year for backyard chicken raising. If you are planning on getting chicks this August or September, or if you already have chicks that you will soon move outside, it is important to plan how to house them in a way that prevents conflict with local wildlife. An adequate chicken coop keeps your flock safe from predators such as raccoons and opossums, prevents wild birds like jays from coming in looking for eggs and getting themselves stuck, and excludes rodents. This way, you can raise healthy and happy chickens while still allowing the rest of your yard to be a haven for wildlife.
Wildlife-proof chicken housing usually involves an enclosed coop attached to an open outdoor area. During the day, chickens can roam freely between the two areas, and at night, they are locked inside the coop to keep them safe from nocturnal animals such as raccoons, opossums, and skunks. Essential elements such as a feeder, waterer, roosts, and nesting boxes are enclosed inside the coop so that the outside area can be "optional." The coop must be built out of sturdy materials so that curious wild animals cannot get in. One option is to start with a pre-built structure such as a shed or aviary, and modify it for your needs. Otherwise, you can build the "frame" of the coop out of wood and enclose all sides (including the top and bottom) with plywood and/or quarter-inch hardware cloth. Don't use larger mesh hardware cloth or chicken wire, as quarter-inch or smaller holes are necessary to keep out rodents.
Some enclosed coops are raised on posts, and have a wooden or mesh floor that is above the ground, while others are built so that the ground is the floor. A common mistake when choosing the latter option is to not line the floor. Even if the walls of your coop are sturdy, an animal with enough dedication can still dig underneath and get in. Lining the floor of your coop with mesh that is attached to the bottom of the walls on all sides prevents this from happening. Chicken wire is fine for this purpose, as rats are unlikely to dig underground to gain access- lining the floor is mainly to keep out larger animals like skunks. In addition to attaching the mesh to the walls of the coop, lining the edges with bricks can provide extra security.
If you are building a raised coop that is self-contained (not in an aviary or other enclosed structure), build the floor with wood, not hardware cloth or mesh. This makes it more secure against raccoons. The coop will still need ventilation, but windows screened with hardware cloth are more secure than a ventilated floor.
The roof of a wildlife-proof coop should ideally be constructed out of wood, sheet metal, or another sturdy, solid material. This not only keeps the chickens dry when it rains, but also adds extra protection against climbing predators such as raccoons. Build the roof with a slant to minimize damage from water pooling when it rains, and to make the top of the coop a less desirable place for rodents to live. Make sure that there are no gaps between the roof and the walls (as might occur with a material such as corrugated metal) so that rodents cannot get in.
Chicken coops can be built with various types of doors to allow access by both chickens and their keepers, but regardless of what type you choose, you must be able to close it securely at night so that wild animals- mainly raccoons- cannot get in. If conflict with raccoons is especially common in your neighborhood (e.g. raccoons knocking over trashcans or entering other chicken coops), you may want to use a padlock. (For ease of access, keep the key on a string tied to the door or get a lock with a combination.). Normally, however, any latch that takes more than one step to open should be fine. For example, you can use a gate latch designed for a padlock and clip a carabiner where the lock would go. Although raccoons have proven to be able to open complex locks in experiments, a wild raccoon looking for a meal would not go through the effort.
In addition to security against raccoons, another consideration with coop doors is wild birds. To deter jays and crows from going after the eggs, and to keep other birds from accidentally getting stuck in the coop, hang strips of burlap, canvas, denim, or another heavy fabric from the top of the door. You may need to start by tying these "curtains" open so that your chickens know that they can go through them, but eventually they will ignore the fabric. A dedicated jay or crow might still be able to get in, but you can minimize the chance of this by locating nesting boxes in a place where the eggs cannot be seen from outside.
Many chicken coop setups involve a free-range area attached to the coop, where the chickens can roam during the day. If you have a large yard, it is best to restrict the chickens to a specific, fenced run- not only to protect your garden from them, but also to make it easier to get all the chickens inside at night. Avoid locating the run around dense greenery or other areas where nocturnal animals might be living. You don't want a chicken to accidentally wake up a raccoon or other animal during the daytime.
If you are concerned about owls or other raptors in your neighborhood, consider building a run that is completely enclosed with chicken wire, including the top. As long as you lock the chickens inside a secure coop (separate from the enclosed run) at night, the enclosed run does not need to keep out raccoons or rodents.
Avoid putting food for your chickens in the run, as this can attract wildlife and make them accustomed to an unnatural food source. Also, keep an eye out for chickens laying eggs in the bushes, as eggs left outside can also attract animals.
To ensure that your wildlife-proof coop stays that way, plan to inspect it from time to time and fix issues that might allow wildlife into the coop. Monitor for evidence of animals trying to dig under the coop, as well as evidence of rodents (such as their droppings) inside the coop. Look for potential wildlife entry points. Replace the fabric "curtains" on the doors as needed. Trim greenery (such as vines) away from the coop to make the area less desirable to rodents and less accessible by raccoons and opossums. It is good to do this inspection every few months, or more often when your coop is newly built, to catch potential problems.