overlooked these birds until today. Before the heat of the day began and as long & as I worked slopes which the sun had not yet really begun to boil down on I found these birds very common, with each isolated brush group having at least one bird, and groups of several occupying larger brush areas. But about 11 a.m., working to the same areas after the sun had been on them for hours, and it was getting warm, these fox sparrows had completely vanished and gave absolutely no sign of their presence.