When determining your character’s ability scores, increase one score by 2 and increase a different score by 1, or increase three different scores by 1. You can't raise any of your scores above 20.

You are a monstrosity.

While Demi-Cockatrices have on average gained more height than their ancestors, many still share a similar stature to them (Medium or Small).

Your walking speed is 30.

Because of your wings, you have a flying speed equal to your walking speed. You can’t use this flying speed if you’re wearing medium or heavy armor.

Your cockatrice ancestry gives you advantage on saving throws against being petrified.

You make an attack with your beak. It has a range of 5 ft and deals 1d6 + your dexterity modifier in piercing damage. If you so choose too, you can trigger the petrifying effect of your beak, of which you have as many uses of equal to your character level divided by 2 and rounded down. This number refuels after every long rest. Upon using this attack with this petrify property, your force the target to make a DC 10 + your constitution modifier constitution saving throw. against being magically petrified. On a failed save, the creature begins to turn to stone and is restrained. It must repeat the saving throw at the end of its next turn. On a success, the effect ends. On a failure, the creature is petrified for for 2d4 -1 turns.

You can speak and write in common. Furthermore, your monstrous ancestry enables you to commune with other monstrositys. The extent to which you can commune with a monstrosity is limited by their intelligence.