Actually, the Purple Martins are back and singing away. Why R2D2? The way the Martins sing and chortle, they remind LOML and me of the Star Wars droid, R2D2.
The Martins are really fun to watch, they only eat bugs that they catch while flying. As a result, they are the most accomplished fliers of the small bird world, if not the entire bird world. They ride the air currents and just sail and sail.
This spring we erected our 5th Martin house. I told LOML that we had enough already, but she went ahead and got a fancy one of 2 stories. On top of that our daughter bought another story/layer that attached to the existing two stories for a total of three. The whole 3 story apartment must have weighed in around 35+ pounds. The base for the supporting pole is 3 feet in the ground with 5 bags of sackcrete to hold it in place.
Most any time the hummingbirds will be arriving, then the 5 feeders go up as does the sugar bill. They are also fun to watch because they are very territorial and play 'king of the hill' at the feeders.