I used to see swifts often, flying over Mima Mounds Natural Area Preserve, but they've been missing for many years. I suspect it's loss of habitat and nesting areas. The nighthawks, though, are still here, I enjoy watching their courtship. As you say, they fly high. The male (I assume) will flutter his wings two or three times, then dive and at the low point of his dive you'll hear the "vooom!" When I attended Evergreen, there was a nesting nighthawk on the flat roofed section of the main building. Plate glass windows overlooked the graveled roof. I saw a female nighthawk on her nest. A crow paced up and down the ledge, he KNEW she was somewhere there and wanted her eggs- but she held very still and he never did see her. I banged on the window to chase him off.
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