Zheng, Xiaoting; O’Connor, Jingmai K.; Huchzermeyer, Fritz W.; Wang, Xiaoli; Wang, Yan; Zhang, Xiaomei; Zhou, Zhonghe
(Public Library of Science, 2014-04-14)
A crop adapted for an herbivorous diet of seeds has previously been documented in the Early Cretaceous birds Sapeornis
and Hongshanornis. Here we report on several specimens of Yanornis that preserve a crop containing ...