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Yard bird.
Pressure testing a residential underground gas line, house next door is using the utility easement as a chicken roost.
At first they scattered, but after about five minutes they were all clucking and circling around me. One really curious one kept pecking at my overalls and my tool tray looking for bugs. 
Lot of the guys now use "Mega Press" fitting on steel, pex, or "Pro Press" copper fittings. It's a crimp system that allows you to speed up a bit, and spend less time sweating/brazing. hvac uses a crimp style fitting even with the new super slippery gasses. The days of brazing, using lead/oakum, or even threading pipe are dying out.
A guy I trained who just recently got his jman card said when he took his practical test they soft soldered ONE 1/2" cap to a piece of pipe, and threaded ONE 3/4" joint. Didn't even count threads on the pipe or pressure test the soldered joint, just wanted to make sure they guys know how to do it.