Blackpoll Warbler

Canon 1D-X, 500mm f4 x 1.4 TC, handheld
f5.6, 1/1250, ISO2500

A bird I haven't seen posted here often. In non-breeding plumage, the species has a drab olive-green head and neck; very different. I followed the bird for more than two hours as it ran boundaries establishing its territory, and never once came out into the open.

75% of full frame. Selective sharpening to the bird. It's a busy background but at wider apertures, the tail was out of focus.

C & C, please. Thanks for looking.