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Spring Field Ornithology
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Don't know of any scientific resource for you, but I do have a personal observation which might be interesting and bring out some others to add comments. I assume you are most interested in nesting holes?
I have surveyed this winter my friend's hundred acres of woodland for nesting cavities. I've located about 25 cavities and see an apparent pattern. All but one face directly south, and all but one are in either Oak or Maple. The largest number are pretty high, usually 40 feet or so. The openings are usually very round as compared to the rectangular excavations which Pileated Woodpeckers make when seeking ants. I'll soon begin monitoring these cavities for possible activity.
Last year, I did observe an active Pileated nest in this same woods. It was about 50 feet up a tall, straight trunked Maple and facing due south. The opening was recently excavated and very round. (The nest failed, and I saw one of the adults remove a single dead chick that was on examination covered with fly larvae.)
How do my observations fit with other's.
Mark Elbroch's "Bird Tracks & Sign" is a wonderful resource.
Click here to find it on Amazon.
Click here to learn more about Mark Elbroch and his work.
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