LearnBoost welcomes Castle Rock
Castle Rock National Wildlife Refuge is half a mile offshore from Crescent City in northern California. This coastal rock covers approximately 14 acres, and rises steeply 335 feet above sea level. The refuge provides an important sanctuary for Aleutian Canada geese and nesting seabirds.
It is, in fact, known as the second largest nesting seabird colony south of Alaska (after the Farallon Islands). The estimated number of seabirds using Castle Rock has been as high as 150,000. It also has the largest breeding population of common murres in California; the latest estimate for common murres was 98,000 in 1986.
Over 21,000 Aleutian Canada geese roost on the island, flying off at dawn to feed in adjacent agricultural lands, returning in the evening. This growing population appears to be impacting the habitat suitability for seabird nesting.
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Heritage registers: World Heritage Sites · World Network of Biosphere Reserves · National Register of Historic Places · National Historic Landmarks · National Natural Landmarks · California Historical Landmarks · California Points of Historical Interest · California Register of Historical Resources