But both the arboreal and the cursorial scenarios have explanatory gaps. 但是那两个理论都有盲点。
As the idea that birds descended from dinosaurs gained acceptance by all but a few paleontologists, so too did the cursorial hypothesis. 鸟类从恐龙演化出来的想法,成为古生物学界的主流意见后,奔跑假说也成为主流。