Large tree with multiple nests and great blue herons flying above.

Large sycamore tree with 160 heron nests. Great blue herons flying above.

View of tree with multiple heron nests. Great blue herons in flight above the tree.

Great blue herons perched on branches next to nests in the top of a sycamore tree.

Adult great blue herons perched on branches and in nests in the top of a sycamore tree.

Great blue herons perched on branches next to nests in the top of a sycamore tree. Image note: thin plate.

Two young California thrashers in a nest, mouths open.

A young Oregon chickadee looking out of its nest hole.

A young Oregon chickadee looking out of its nest hole.

Ruffed grouse chicks and eggs in nest. Image note: chicks blurred, not very good.