This rich, yellow part of an egg contains nourishment for a growing chick.
Yolk
Chickens of this breed are prolific egg layers, and also share a name with a Looney Tunes character. 
Leghorn
This slang phrase means to leave or stop because you are afraid.
Chicken out
This body part on the top of the chicken's head comes in many shapes and is mostly decorative. However, it can also help with cooling, so will be bigger on chickens from warm climates!
Comb
This chicken character is known for crying "The sky is falling!"
Chicken Little
True or false? Hens will not lay eggs unless they are around a rooster.
False
This breed of chicken originated in South America and lays blue or green eggs. They are frequently crossbred with other chicken types for their egg color, and either the original name or the very similar crossbreed name will work!

Aracauna/Americauna
A group of chickens is called this.
Flock
Most chickens have 4 toes on their feet, 3 facing forward and one facing back. However, a few breeds, like Silkies and Faverolles, have this many toes instead.
Five
This Looney Tunes character is loud and extremely confident, two common characteristics in real life roosters!
Foghorn Leghorn
Which of these colors is not naturally found in chicken egg shells? Blue, brown, purple, white, beige, pink, or green?
Purple
This type of chicken, named for the smallest US state, is a popular backyard breed, due to their friendly nature and steady egg laying.
Rhode Island Red
The name for a young hen, usually a year old or less.
Pullet
Molting is the (usually) once yearly process of chickens losing and replacing these.
Feathers
People have been joking about why a chicken did this since at least 1847.
Cross the road
This mineral is needed for building egg shells, and is often provided to chickens in the form of oyster shells.
Calcium
This chicken breed is named for its soft, almost fur-like feathers. They are very popular as pet chickens, because they are friendly as well as soft!
Silkie
This chicken-related term is a common alternate name for a bachelorette party in England, Ireland, Australia, and New Zealand.
Hen Night or Hen Party
They're not cowboys, but most roosters have some of the same equipment! These pointy projections on roosters' legs are used for jabbing opponents in fights, either other roosters or predators.
Spurs
This movie from 2000 features claymation chickens trying to escape from a farm, and parodies a variety of classic WWII prisoner of war movies.
Chicken Run
It takes a surprisingly short time for chicks to develop in an egg. Once a hen starts sitting on her eggs, chicks will hatch from viable eggs in this much time.
3 weeks/21 days
This very hardy chicken breed was developed in Australia from English Orpington chickens, as you may be able to guess by their name. The traditional color is black, but they can be found in a variety of other colors, like blue, white, and golden.
Australorp
This term is used for a hen that is ready to sit on eggs, or actively sitting on them.
Broody, brooding (Can accept "setting" if no one gets "broody.")
Instead of a stomach, food goes into this organ when chickens swallow. They also swallow small stones and grit to help grind the food up once it is there.
Crop
This artist's 2002 music video for "The Remedy" features him collecting chickens in a car and taking them for a drive.
Jason Mraz