We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDevelopmental mechanisms facilitating the evolution of bills and quills.AuthorsSchneider RAPublicationJournal of anatomy, 2005, Vol 207, Issue 5, p563ISSN0021-8782Publication typearticleDOI10.1111/j.1469-7580.2005.00471.x