We have two macaws and use a kitty litter box filled with the horse bedding pellets for their main poop spots. There we have to stir them as they don't, but in the coop, the chickens take care of that. ☺️ We also use them in our brooder when the chicks are about 4-5 days old. Game changer...
A ventilation consideration:
The reason for ventilation is chicken poo is high in ammonia and secondly, humidity has to stay low to prevent respiratory illnesses.
That said, we've been through it and it was so bad in our coop when we started 8 years ago, I'm surprised our silkies lived. Mold...