The presence of predatorial burrowing owls on the Farallon Islands deep into winter is harming the survival of adult ashy storm petrels, according to a study published by Point Blue Conservation Science. Owls arrive in the Farallones around mid-October, when the islands’ invasive house mouse population is at its peak. Several opportunistic owls stay to feast on one . . .

You have reached content available exclusively to Point Reyes Light digital subscribers.

Receive a 3-day free trial of unlimited digital access.

Already a subscriber? Login here.