All About Birds↗ | Audubon↗ | eBird↗
"Bluebirds struggle to breed when there is a lack of tree cavities. Nest boxed help" according to the Wingspan card
Wellfleet Audubon R7 + 800mm F11, ISO 1250, 1/400(7MP crop, equiv 2016mm F29)
Wellfleet Audubon R7 + 800mm F11, ISO 2000, 1/320(21MP crop, equiv 1494mm F20)