Most modern birds solved this issue by evolving shorter appendages to accompany their tertial feathers. But even though Archaeopteryx possessed those long arm bones, it also had proportionately sized ...

The predentary bone is one of the most enigmatic skeletal elements in avian evolution ... mobile - thus representing a now extinct form of cranial kinesis. Cranial kinesis occurs when joints ...

A study reconstructs the palate of an Early Cretaceous bird. Cranial kinesis--relative movement between the braincase and the upper jaw--occurs in most living birds. The origin of this ability is ...