I literally was just doing a Google search because I wondered if it was common for that breed!They sure are cute. Sebright hens are known for crowing. If you do a search on BYC you'll find it's reasonably common. I had an Orpington pullet who crowed every morning until she started laying and after that she never crowed again.
Didn't find anything solid, so I thought it was just me lol.
Glad you said that.