Great blue heron nest and eggs.

William L. Finley in a tree photographing a great blue heron nest. A young bird is perched on a branch nearby.

Great blue herons in a colony. Two birds just leaving.

View of a great blue heron nest and eggs.

View of a great blue heron nest and eggs.

Unmounted lantern slide of an adult great blue heron perched on a branch beside its nest. Original negative: OrgLot369_FinleyA0540.

Unmounted lantern slide of young great blue herons standing in a nest in the tules with their heads and necks stretched up. Similar to original negative: OrgLot369_FinleyA2110.

Large leaning sycamore tree with great blue heron nests.

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

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