ISA Brown Rooster?

[MickWithChicks]

Yes, hens can crow. Especially if there is not a rooster in the flock. Not common, but it can happen.

Hens can crow but roos can't lay. Imagine the size of their eggs if they could though!

 

[EggWalrus]

Hens can crow but roos can't lay. Imagine the size of their eggs if they could though!

But a Cockatrice can do both! Best to kill every one that hatches or you will be in for bad trouble!