At first they are covered with down feathers. At 1 week of age their feathers begin to form. They can hop but chickens cannot fly. Their wings are not strong enough and they have too much muscle or body weight. All baby chicks are not yellow.
Some chicks are white with black feathers mixed with white or yellow.
The chromosomes and the color of their parents determine their color. The food they eat can also determine their color. Corn and bean meal contains carotene which colors the feathers. The chickens came from Wisconsin. Soon I will be going to Wisconsin to pick up another 2,000 chickens.