Hello there and welcome to BYC!
You have been given some great advice here. I am thinking along the lines with Drumstick Diva. They could be singing the egg song and you are mistaking it for a crow. Definitely post some pics in our What Breed and Gender section for help determining if you do in fact have hens instead of roosters.
Good luck and we do welcome you to our flock!

You have been given some great advice here. I am thinking along the lines with Drumstick Diva. They could be singing the egg song and you are mistaking it for a crow. Definitely post some pics in our What Breed and Gender section for help determining if you do in fact have hens instead of roosters.
Good luck and we do welcome you to our flock!