A cat carrier should be fine overnight. Simple to make a cage with a roll of wire fencing from the hardware store. Zip ties or wire to fasten it together. Fencing comes with 1" by 1" or 2" by 4" openings, both okay for containing a pigeon. Or a pigeon and his mateI don’t currently have a separate cage but clearly I need one!!! I have a cat carrier! Is that too mean/small? He’s really not letting anyone near all 9 of them!!! His original mate died like a month ago but he is pretty much mated up now with a new bird. So she follows him and they will both kick anyone out.
 .. Or possibly you could chose a nest box for him and his mate and just lock them in for a few days. Then let them out under supervision to see if he backs off the other boxes.
.. Or possibly you could chose a nest box for him and his mate and just lock them in for a few days. Then let them out under supervision to see if he backs off the other boxes. 
	 
 
		 
			
		
		
		
	
	
			
		 
 
		 
			
		
		
		
	
	
			
		 it is just about dark now, so you wouldn't be able to see them.
 it is just about dark now, so you wouldn't be able to see them. 
 
		
 
 
		 
 
		 
 
		 
 
		
 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		