Purple martins are sometimes picky birds, when it comes to nesting. As others have said, it is advisable, to exclude other species, till the martins arrive, by closing off the holes. I would bring the box down, clean it out, and measure the holes, to make sure that they are within the right size range, and plug all the holes, right now. then leave the box down, and when the purple fellows arrive, unplug, and elevate. Here is a good site for bird info:
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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