The Yellow Warbler (Dendroica petechia), is not a permanent resident of west Texas. They only make occasional appearances here during migration. For that reason, I felt lucky to get to see this one at San Angelo State Park, back in September of 2009. I was sitting in the blind there when it flew in and entertained me and Ann for a few minutes.
Back then I still owned my Canon EOS 40D. I used my Canon 100-400mm zoom lens, hand-held. Exposure was 1/500 sec. @ f6.3 with ISO 400, aperture priority.