The chicken has a 50% chance of being a rooster.
Beak. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Crow (Rooster Only, 1/Day). When it is sunrise on the material plane, every creature within 400ft. of the chicken that has a passive Wisdom (Perception) of 8 or higher is awoken from any nonmagical slumber. A creature that is deafened is immune to this effect. For every 50ft. away from the chicken a creature is, the required passive Wisdom (Perception) score is increased by 1. If a creature's ears (or other sound receptacle)is plugged or otherwise blocked, the creature is considered to have disadvantage on this passive check, conveying a -5 penalty to the passive perception score. This Reaction must be taken if possible, can still be taken if the chicken is on another plane of existence, but has no effect if the chicken is unable to make noise. It the chicken is unable to take this reaction, it will take the reaction as soon as it can. When the chicken is unable to see the material plane's sun, roll a die. If the roll is even, the chicken will think it is sunrise on the material plane 1d4-1 rounds early, and on an odd roll will think sunrise is 1d4-1 rounds after it really occurs.