Chickens are birds.
You might have to think about that for a moment. We tend to think of chickens as dinner. But chickens were and are wild birds, just like robins or grouse.
The father of all chickens is the wild red junglefowl of India, Southeast Asia and Indonesia. Junglefowl look like chickens, but are much prettier. Older, too, with a fossil history of 50 million years.
Junglefowl court, mate, lay and incubate eggs, and raise chicks. They do this once a year, as birds do. The chicken we're most familiar with, the factory chicken that laid the eggs you may have in the fridge, produces almost one egg per day.
A website I found lists 64 breeds of chicken, all developed by selective breeding favoring certain physical characteristics. That's why we have uniform broilers and egg-a-day birds.
Back-yard chickens are fashionable right now, an urban agrarian fad, although city ordinances play a limiting role. In Minneapolis you can keep in your yard as many chickens as 80 percent of your neighbors will accept. Plymouth, on the other hand, is vegetarian when it comes to live chickens.
I thought (momentarily) about chickens as a hobby when I received and read a review copy of "Chick Days: Raising Chickens From Hatchlings to Laying Hens." Author Jenna Woginrich says that caring for a small flock of chickens is easier than caring for your cat.
Really?