Where and how do offspring develop in wood peckers?

Offspring develop inside a nest cavity excavated by both parents in tree trunks or branches of living or dead trees, telephone poles, utility poles, fence posts, or dead wood in other wooden structures. Both sexes incubate. Young hatch blind and naked. Nestlings are fed exclusively by regurgitation by both parents until old enough to leave the nest, at four to five weeks in most species. Some tropical species stay in their burrow longer, up to 77 days before fledging.