10/24/2026
🕸️ Species Spotlight!
What in the worldwide web is that?!
These fascinating webbed structures are easy to spot along Big Basin Highway and in other locations throughout the park. While fall is typically the time for our spider neighbors to shine, these shimmering webs aren’t made by spiders at all!
Often found in madrone and walnut trees, these communal webs are home to the fall webworm. And in another twist of science versus common names, a webworm isn’t actually a worm! The webs are filled with web-spinning caterpillars that will eventually transform into fall webworm moths (Hyphantria cunea).
These silken shelters provide the caterpillars with protection and warmth. Although the caterpillars munch on the leaves inside their webs, these colonies generally don’t cause lasting harm to their host trees. In fact, the fall webworm moth is a night pollinator.
Nature is full of surprises! We hope you’ll stay curious and explore the wonders of your local parks.
🍂 Happy fall from Big Basin Redwoods State Park!
