Tilden Nature Area, Contra Costa, California, US
May 5, 2017 8:30 AM - 11:30 AM
Golden Gate Audubon Society First Friday Walk, May 5, 2017.
We met at the Tilden Nature Area parking lot and walked to Jewel Lake on the road and Boardwalk, with a detour on the service road to see an Anna's Hummingbird nest in a California Bay tree. FOS Swainson's Thrush for many today.
Theme was syrinx and brain. See Cornell Laboratory of Ornithology's third edition of Handbook of Bird Biology for details. The non-Passerine birds who show vocal learning, the Parrots and the Hummingbirds, each have a learning system in their brains that is different from (but analogous to) the song learning system in the songbirds.
Here are the 33 species seen by the MoB (many observers) of 38 birders:
Anna's Hummingbird on nest
Bewick's Wren wren hat trick!
Swainson's Thrush First of Season for many observers
Best of Boids!
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