Visiting Castle Rock breeding bird colony
By Patricia Bacchetti
Early May marks the occurrence of Godwit Days, the annual birding festival in Arcata, in Humboldt County. By doing some advance planning this year, I was able to register and attend this well-run event with friends. Be warned: The popular trips fill quickly, so check out the schedule in February if you are planning to attend. The highlight of the trip, in addition to David Sibley’s keynote address Saturday night, was a two-day trip from Arcata to Brookings, Oregon, along a stretch of the coast that I’d never birded before.
One of our first stops was the picnic grounds at Wilson Creek, off Highway 101 just north of the Del Norte County line. A beautiful pair of wintering Harlequin Ducks was resting under the bridge: It’s a species that’s always hard to find in the state, particularly in pairs. They used to breed in rushing streams in the western Sierra, but haven’t been documented for years. This pair was likely heading north to Alaska to breed.
Harlequin Ducks at Wilson Creek, by Patricia Bacchetti
Our next stop was Castle Rock National Wildlife Refuge, one-half mile off the coast near Crescent City. The fourteen-acre rock hosts the second-largest colony of breeding seabirds south of Alaska, surpassed only by the Farallon Islands breeding colony. Common Murres are the most numerous species, and the rock is considered their largest breeding colony on the coast of California. They’re joined by small numbers of Tufted Puffins, Pigeon Guillemots, all three cormorant species, Rhinoceros and Cassin’s Auklets, Western Gulls, and both Leach’s and Fork-tailed Storm Petrels. Northern Elephant Seals and Harbor Seals also breed on the island. Aleutian Cackling Geese have made the island a night roost, and they fly out to the pastures of Humboldt and Del Norte Counties to feed during the day.
Common Murre by Patricia Bacchetti
Castle Rock was privately owned until 1979, when it was acquired by the The Nature Conservancy. Recognizing its importance for breeding sea birds on the north coast, the U.S. Fish and Wildlife Service bought the island and put it into the National Wildlife Refuge program in 1980. Besides Southeast Farallon Island, it’s the only other off-shore National Wildlife Refuge in California. The rock was an important foraging site for the local Tolowa people in times past, and that history is commemorated at the Point St. George entry site.
Rhinoceros Auklet by Patricia Bacchetti
Castle Rock at Point St George / Photo by Patricia Bacchetti
We went to Castle Rock hoping to see Tufted Puffins at their breeding burrows, but because they’re actively feeding in the water during the day, we didn’t find any that day.…

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Bob Power and his Southern Alameda County team.
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