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The field marks that I used to ID this bird are the beak which is relatively long and heavy with no hook on the end (a hooked beak would suggest a vireo). The wing bars, the white belly and undertail covers, the dark cheeks and the faint blurry streaks on the sides of the breast all point to female Pine Warbler. When checking the range map Pine Warbler is an expected species at Brazos Bend State Park.