Check Pattern

This pattern gene causes checks to appear on feathers across the entire wing shield. The two solid bars is sometimes still seen. The amount of flecking differs. Some birds have only a little bit of dark flecking on the shield, others are darker. Checks (or darkening) may be seen on the back and between the shoulders of the bird, and sometimes on the breast, though never on the rump.

Breeds
The check mutation is extremely common and can be found in most (if not all) breeds