Given that this is a rumour network, you are entitled to rumour the rego of the particular aircraft... no harm in that.
I recall a certain Archer at a Vic field that got a birds nest built in it practically every time it flew. They seem to like the right hand side on the oil cooler as it stays cool for quite some time after flight. I know of a Cherokee 6 in use that has some birds living in the wing at the moment. The owner leaves a control lock on at full aileron deflection and this enables the birds to get in the end of the wing.
There must be some great birdsnest stories out there. I recall flying next to a Cirrus that had a birds nest in it that caught on fire and when it arrived at the airshow on fire someone decided to call the fire brigade; as they taxiied to the display line the firetruck was blaring away behind them in chase. 'twas amusing stuff.