The dinosaurian origin of birds had gained broad support since the resemblance between birds and theropods was first recognized by Huxley (1868) and other paleontologists.

• 自从鸟类和兽脚类恐龙之间存在相似之处在1868年得到赫胥黎和其他的古生物学家的首次公认以来，鸟类的恐龙起源便获得了广泛的支持。