Canvasbacks are so-named for their whitish backs, the color of undyed canvas. Their white back contrasts sharply with their chestnut-colored head, and they are further distinguished from other diving ducks by their sloping forehead and bill. They are only likely to be confused with Redheads, a smaller diving duck that lacks the sloped forehead and has a black-tipped blue bill with a gray back.
Canvasbacks are among the least abundant duck species in
Sensitivity to changes in available food resources, especially of plant tubers, has resulted in Canvasbacks changing their migratory and wintering behavior over the last 50 years. When food supplies were eliminated due to sedimentation and pollution on their traditional migratory stopover sites in
A male Redhead was observed in the
The official eBird stats were released this week. A record 6,047,650 birds were reported on 442,985 checklists submitted in 2007.
You can explore all the birds reported last week in