Beak Variation in Ovenbirds (IMAGE) University of Oxford Caption A phylogenetic tree illustrating evolutionary relationships and beak variation among 350 lineages of ovenbirds. Credit Joseph A. Tobias and D. Seddon, images reproduced with the permission of Lynx Edicions. Usage Restrictions Any use must make reference to the credit information and note that the images are reproduced with the permission of Lynx Edicions. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.