I built a timber frame pavilion a couple years ago. Then put a couple fake owls on each end truss to keep the birds from building nests up in the rafters. They fly right underneath them and immediately built a nest on the top of the ridge beam.
Had one on by garden post, an Osprey would visit daily and sit there, hoping for a date I think.
LOL...not surprised.
The top of our chimney is WAY up there, 35’, maybe 40’ off the ground. You need to get on a ladder from the ridge to reach the top of the chimney.
I need bird spikes or a metal wire cage over the caps.
After years of beating on the two caps, I’m surprised there is anything left of them.
I’ve used a decoy coyote to keep deer out of the garden, but the same problem. The deer know it’s fake. It helps if I move it every couple of days.