This is the finest shot of a Boreal Chickadee I've seen. It was taken earlier this month in Marathon by Alan Wormington during his annual spring birding swing across northwest Ontario. Thanks for sharing it Alan.
For those not well acquainted the species, it tends to be far less inquisitive and more active than its Black-capped cousin. It's a challenging subject to photograph.
The shot is so rich in tack-sharp detail, it's best viewed at a larger size.
(click to enlarge)
Boreal Chickadee by Alan Wormington.