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

43. Great Blue Heron

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.

GREAT BLUE HERON NESTING INFORMATION (From birdsoftheworld.org)

Nests - In North America, Great Blue Herons start building their nests in February, with males choosing a nesting site and attracting females. The female builds a platform nest using sticks, twigs, bark, and needles, while the male gathers the sticks.
Eggs - oval to long oval, long elliptical or subelliptical. Dull pale blue, fading slightly with age. Clutch size 2 to 6 eggs.
Incubation - both parents incubate them for 25–29 days
Fledging - The parents bring food to the young at the nest for two months before the young can fly, and continue feeding them for a few weeks after fledging the nest.

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