Males and females are identical except for the red patch at the back of the head, and are distinguished by the large beak almost as big as the head from a Downy. Here are some facts:
1) They mainly eat insects but will eat berries, tree sap and suet at your feeders.They dig feripously and will peel bark to forage.
2) They prefer to nest in popular or aspen trees and are cavity nesters competing with house sparrows and starlings in more urban areas. They prefer forest areas.
3 The tail feathers are pointed and act as a stabilizer as the bird climbs trees. If you have seen the aerobatics of these birds, you'll now understand why they can do what they do.
Most of the facts are from http://wwww.wba.comchipperwoods/photos/hwood.htm
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