Double-crested Cormorants (Phalacrocorax auritus) perch on a drowned tree near Obsidian Butte, Sonny Bono Salton Sea Wildlife Refuge (EL -227ft).  This habitat for migratory birds is located along the course of the Pacific Flyway in the Imperial Valley of California.  Flooding by the Salton Sea has reduced the manageable area from 36,700 acres to 2,200 acres.  Dykes (dikes) now limit further encroachment.
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