Caterpillar webbing and frass on oak leaves
This is webbing associated with an untidy caterpillar rather than a spider - along with frass (caterpillar poop) and partially skeletonized leaves of the Coast Live Oak (Quercus agrifolia, Fagaceae) tree that it's on. I'm not sure what kind of caterpillar is responsible, but I have photos of them here and here among others. Spiders aren't the only ones - Happy Web Webnesday! (San Marcos Pass, 7 March 2021)
Caterpillar webbing and frass on oak leaves
This is webbing associated with an untidy caterpillar rather than a spider - along with frass (caterpillar poop) and partially skeletonized leaves of the Coast Live Oak (Quercus agrifolia, Fagaceae) tree that it's on. I'm not sure what kind of caterpillar is responsible, but I have photos of them here and here among others. Spiders aren't the only ones - Happy Web Webnesday! (San Marcos Pass, 7 March 2021)