Reading the gallinary is like going to a chicken coop and finding all types of gallus gallus domesticus of all shapes, crests, legs, ages and... discovering that they have a nice temper!
In the henhouse there is also a machine to look at the chickens under x-rays, one to do ultrasound scans and another to find out if they are fit to fly, there is a chick that grows and an egg that breaks, there are feathers of all colors, very small chickens and chickens as tall as you who read to us and are 3 years old (what does a chicken look like from below?), chickens doing yoga and sick chickens, chickens listening to music and stories about chickens.
In short, the chicken house is full of chickens, and we can't stop talking about it.