This year looks to be one of the worst years I've experienced for California Oak worms. Some Coast Live Oak trees on the course have been completely defoliated. Not only are they destructive, they are pretty much just gross. I'm hoping the worst is over at this point of their life cycle and will they will begin pupating into moths.
Below are a few pics of the worms in unexpected places!
A link to a good resource for information on the worms is listed below :