So you know the "bock bock" sound?

Hens make it occasionally when laying eggs, but it's also the rooster alarm sound. The "cock-a-doodle-doo"/crowing sound is more the all-clear/I'm-a-rooster-here-I-am/flock-assemble cry.

When there's a threat, the rooster switches to a loud, BAWK BAWK BAWK alarm.