I have one Rooster (of three, bottom of the rooster totem pole) who screams/screeches when I go into the coop at night. This is usually if I close up the coop after everyone is roosting.....but then have to come back in and open the door up a few minutes later (usually to collect eggs or bring in stragglers). He makes this screaming/screeching sound as I go in there. Is it a "watch out for predator" sound? It sounds like a pterodactyl or something. First time it happened it really freaked me out. Now I am used to it, but I know it would scare any "newbies" who tried to enter the coop after dark. My other roosters don't usually do that....they ignore me (and I ignore them).