The Bolsa Chica Ecological Reserve is an approximately 1,300 acre coastal estuary. Habitats include open water, mudflats, salt marsh, coastal dunes, seabird nesting islands, riparian, and freshwater marsh. More than 200 avian species have been identified at Bolsa Chica and the reserve is very popular with birders and photographers. wildlife.ca.gov/Lands/Places-to-Visit/Bolsa-Chica-ER bclandtrust..