Walnut Creek Open Space Foundation
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Out of Sight . . . but still present

As the photos of these two bird's nests make clear, there are differences in materials and construction that would give you an idea what species built it even without the eggs.

 

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Titmouse nest
Bob Brittain

Western bluebird nest
Bob Brittain

Red-tailed hawk's nest in a valley oak tree
Lesley Hunt

Acorn woodpecker granary tree.  You can see light brown acorns in some holes; others are empty.  The holes are typically in rows like these.
Brad Heckman

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