An early Cretaceous bird from Liaoning Province, China. It is one of the earliest to show the advanced avian features of an extensive synsacrum and complete fusion of the distal tarsal bones with metatarsals.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。