*Oology is a branch of ornithology studying bird eggs, nests and breeding behaviour. The word is derived from the Greek oion, meaning egg.

12. Acorn Woodpecker

This part of the Stanislaus Audubon Website is focused on 44 common Central Valley nesting species with background about their nesting habits. Please check the Great Valley Museum Central Valley Egg Collection starting page for links to all the featured species.

ACORN WOODPECKER NESTING INFORMATION (From birdsoftheworld.org)

Nests - Excavates its own nest holes in whatever large trees are available. Nest holes may be used repeatedly for many years; at Hastings Reservation, about 50% of nesting attempts are in a previously-used cavity.
Eggs - Eggs are flat white, elliptical, smooth, and have no markings. Clutch size is usually 5 (ranges from 4 to 6).
Incubation - Incubation period is 11 d. Both male and female breeders incubate
Fledging - Nestlings leave the nest approximately 30–32 d after hatching. All group members normally help feed chicks beginning with the hatching of the first chick in the nest.

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