"record his territorial song and play it back. He will go away after he gets a load of the “other” bird’s what for."---------------------- Is that really worth a try? If it is, next Spring, I'll do it... because I can't tell you how many times I've been woken up at 4 in the morning. In fact, next Spring, I'm putting one of these ballons on my roof. If it works for NASA, I'm hoping it works for me.
Works.
They are not "singing"
They are letting all other comers know this is "their" space and to keep away.
years ago i did a study. (1982)
Record for a few hours, then play it back.
They would explore the source of the sound, then go away.
Took about a week to come back after no more recording playback.
Let me know how it works for you!