In sky. 4 of them.
Top part of the Hamms Gulch trail near Skyline. Here's a shot of a field of them.
Need ID help re Greater or Lesser Yellowlegs.
Scaly top, bruises yellow, dry top, small mammal chew marks. Growing on wood chips at Stanford campus (outside Memorial Church). Possibly Agaricus?
Interesting plumage here - first-year bird molting into breeding plumage?