1. Natural selection and coloration: protection, concealment, advertisement, or deception?;Bortolotti,2006
2. Techniques de vol et de cassage d'os chez le gypaète barbu Gypaetus barbatus;Boudoint;Alauda,1976
3. Thermoregulatory role of the unfeathered head and neck in male wild turkeys;Bucholz;Auk,1996
4. An analysis of physical, physiological, and optical aspects of avian coloration with emphasis on wood-warblers;Burtt,1986
5. Multiple factors in the evolution of animal coloration;Cloudsley-Thompson;Naturwissenschaften,1999