obscura and nevadae of the woodhouseii group. References Further reading Madge, Steve; Burn, Hilary (1994): Crows and jays: a guide to the crows, jays and magpies of the world. A&C Black, London. External links Western scrub jay Species Account – Cornell Lab of Ornithology It takes a thief to know a thief – University of Cambridge Comparative Psychology of Learning and Cognition Lab article on studies of the cognitive abilities of western scrub jays (Archived on the Wayback Machine) California scrub jay Native birds of the Western United States Fauna of the California chaparral and woodlands Fauna of the San Francisco Bay Area Birds of Mexico California scrub jay California scrub jay California scrub jay California scrub jay