What's Inside a Woodpecker's Nest Hole?
Many woodpeckers chisel out deep cavities in tree trunks in order to lay their eggs and raise their brood. The cavities hollowed out by the birds vary in size, depending on the species of woodpecker. The chamber of a tiny Downy Woodpecker descends about a foot from the opening, while the Pileated Woodpecker may chip out a chamber two feet deep. Both are beyond the reach of a pesky raccoon.
Most North American woodpeckers carve a new nest cavity each spring.
More info and transcript at BirdNote.org.
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