Mayhew 1947 Mar. 9 Audubon's Warbler Crows Landing Highway, 9 miles south of Modesto, Stanislaus Co., Calif. at 12:30 P.M. one individual (or) was seen on the corner post of a dairy corral. His yellow throat patch & wing patch were very prominent while he was stationary. His yellow rump patch showed up prominently when he would sally forth after an insect. While perched, he moved his head constantly from side to side. Occasionally he would hop a few paces along the fence rail, stop & look about, then hop along a few more paces. at 12:38 P.M. he did a series of acrobatics after an insect, then lit in a sycamore tree. When he was doing his acrobatics, the prominent white patches in the tail were easily seen. at 12:45 P.M. another or was seen operating from an electric wire about 12' off the ground. He was very active at this time, leaving the wire very often & catch insects. All the time he uttered a simple call note, which was uttered about every 3 seconds.