Why do chickens crow at dawn?

Online Answer
Crowing is a warning signal advertising territorial claims. Our preliminary data suggest that the highest ranked rooster has priority in breaking the dawn, and lower [ranking] roosters are patient enough to wait and follow the highest ranked rooster each morning, said Yoshimura.
Related Questions 📌
Crowing and the pecking order Many studies on roosters confirm that one main reason a rooster crows is to assert dominance and territory. When a hen crows, the most common reason is because they are on a power trip. This crowing behaviour may also be accompanied by bullying behaviour in the chicken coop.