Your Constitution score increases by 2, and your Charisma score increases by 1.

Chickens reach maturity by age 3. Compared to humans, chickens don’t usually live longer than 30 years.

Many chickens are lawful, but some are chaotic.  They don't have a strong tendency towards good or evil.

Chickens are about 4 feet tall and weigh between 80 and 100 pounds. Your size is Medium.

Your base walking speed is 25 feet.

You have a flying speed of 30 feet. To use this speed, you can’t be wearing medium or heavy armor.  Once you use this speed, you cannot use your fly speed on your next turn.  If you spend your turn flying and end that turn in the air, you will begin to fall to the ground on your next turn.

You can crow very loudly to distract your opponents.  As an action, you can make all creatures in a 15 foot cone that can hear you make a Wisdom saving throw.  Creatures that fail this saving throw have disadvantage on their next attack roll or ability check.  The DC for this save is 8 + your proficiency bonus + your Charisma modifier.  

You can speak, read, and write Common and Auran.