territory intruder

I've had problems with Wrens being ... well bird brained about things before (here). But now that I'm living more or less in Wren Country its becoming more common.

Sitting at the table this afternoon I was conscious that the Wren "territory calling" sound was becoming a bit more acute ... so I looked out the window and sure enough, this Wren had found another rambunctious intruder ...

It alternatively attacked the other bird and sat calling for the rest of the tribe (Wrens are group birds with one dominant male) to assist with driving this intruder off ...

The regular "shopping bag over the mirror trick" seemed to work ... and I have enough bird guano on the bike to start a company selling it..