|A White-winged Crossbill was waiting for us when we got out of the car!|
While we watched them, we tried to figure out how they were cracking open the cones to get to the seeds. We could see them working the bracts apart, but had no idea how they were using their crossed bills to do it. Later that night, I got a few of my birds books down to see if I could find out. The answer was easy to find and was in the first book I opened. Bernd Heinrich, in his book Winter World, offered an explanation. He wrote that a crossbill's upper bill is two centimeters long and crosses over a one-half centimeter shorter lower bill. To open a cone bract, the bird inserts a partially open bill into a bract, then closes its bill. When closed, the bill tips separate the bract laterally by about 3 millimeters, just enough for the bird to open its bill slightly and use its barbed tongue to dip in and grab the seed (Heinrich, Winter World, page 37).
Eventually, Matty went off looking at tombstones and did a few rubbings to try to figure out dates and names on the oldest and most weathered stones, and I did a quick sketchbook entry to record our day. We had been to Caesar Creek earlier for a picnic lunch and had seen lots of birds, but the White-winged Crossbills stole the show. In 2009, White-winged Crossbills showed up for a while in Cincinnati, and it was exciting too, but this year, the irruption seems bigger. I can't wait to see what else winter brings!
|...sketchbook entry completed in the field. It was very warm that day...65 degrees F.|
Happy birding, everyone!
Kelly from Red and the Peanut