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163 pages, Kindle Edition
Published October 9, 2018
Bills are joined to a boney core that is attached to the skull. The bill has a covering, called the rhamphotheca, which is more like a sheath and grows throughout the life of a bird. The rhamphotheca is usually hard and hornlike and includes the tip and biting edges of the bill. However, in some birds, such as the ducks, sandpipers and pigeons, it is softer and more leathery. (pg. 39)