Buwitre: Pagkakaiba sa mga binago

{{cite journal

| title = ''Why do vultures have bald heads? The role of postural adjustment and bare skin areas in thermoregulation''

| doi = 10.1016/j.jtherbio.2008.01.002

| author = Ward, J.; McCafferty, D.J.; Houston, D.C.; Ruxton, G.D.