To our knowledge no one has reported sustained observations of the nest behavior of the California Scrub Jay (Aphelocoma coerulescens). Incomplete observations of one nest were reported by Michener and Michener (1945). On 28 March 1972 we found a completed nest on a steep ravine about five feet from the ground in a Toyon (Heteromeles arbutifolia) on the Point Reyes National Seashore in Marin Co., California. We watched the nest from a blind 30 feet away for 61 hours and 53 minutes on the 2nd, 5th, 6th, 7th, 8th, 10th, 11th, and 17th days after the first egg hatched and once during the incubation period. Since the parents had been color banded previously we knew that the female was 4 years old and the male at least 3.