Circle of life.....

This adult female Long-bodied Cellar Spider is surrounded by newly hatched spiderlings and is feeding on a small Marbled Cellar Spider (Holocnemus pluchei), identified by its broad, black ventral stripe.

Both of these species are introduced to North America and are frequently found in and around homes. Where I live on the central California coast they appear to separate by habitat with Marbled Cellar Spiders found outside of buildings and Long-bodied Cellar Spiders inside.

See also:
https://www.inaturalist.org/observations/60322513

Zuma Canyon
I think there were a few of these around as they were on the broomsage and when I would approach one of the plants light colored moths flew off. This was the only one that landed where I could find him.