Hi all, The bird was observed moving along in group including RCKI, BGGN, RBNU, Black-throated Green, Nashvillle and Yellow-rumped. Very drab individual with very greenish wings, low contrast tertial edging and very low malar/throat contrast. I would say very drab, even for Cassin's. The bird was observed in large pecan and cottonwood in the hilly southern portion of the Lake Bluff trail just before the drop-off into the large grassy field- approx 100 yards before the drop-off.