The incubation period of chicks is 21 to 29 days in most species.
Chicks are like human precocious at birth because they hear and see immediately after hatching.
We favor birds to inner ear studies for these reason. Like its human counterpart, the membranous portion of the inner ear forms twisted passages referred to as a labyrinth. Each conduit is designed in such a manner that movement of the head in any direction stimulates hair cells to interprete motion sending the sensetions to the brain. We sense motion and sound waves because the inner ear is capable of efficiently translating mechanical changes into neural stimuli. The process is complex and its understanding requires years of training.