These owls are very hard to find and blend in with their surroundings incredibly well. You can be looking right at them and not see them. They are nocturnal and sleep during the day. Consistent activity around a roosting site can cause them to expend too much energy that is needed for the nightly hunting. If you ever stumble across a roost, please use discretion and proper etiquette. That being said, they are very approachable (within reason) and will let you know if you are too close based on their facial expressions. I will try to show you the various stages that they show you, with the 4 owls at this particular roost, in the following pictures:
Acknowledging you but showing content
Notice that they might look at you, but their eyes are mostly closed. They still watch their surroundings, in case of any potential threats, but are fine with your presence. They will most likely go back to sleep, but you should keep your distance.
A little too close for comfort
Notice how their eyes are mostly open. They are intent on watching you, to make sure you are not a threat to them. At this point you should move away slowly and give them their space, so they can return to sleeping.
Too close, back off
Notice their eyes are wide open and they consider you an immediate threat. If you end up at this point, try to move away very slow and quietly. Failure to do so will most likely end up in flushing one or more from the roost.
Nice content! Thanks for sharing.
Than you! You are welcome!