I spotted 3 bright white feathery balls in a tree on W. Silver Lake.

Amy Clarke confirmed what they are, Snowy Egrets. Here is a link to read about the egrets and more of the birds we see locally. The Los Angeles River Guide

photo from The L A River .com, reconnecting Los Angeles with its river

And here is a new arrival, not yet identified on the L A River website. Makes ya smile tho'.