|(C) Matt Martyniuk|
The claws on the wings of Jeholornis are also of great interest. One of the age old questions surrounding birds is when did the hands change such that they no longer ended in claws, but only phalanges supporting feathers? As more and more fossil birds come to light the timeline of clawlessness becomes slightly clearer. It may not ever be definitively known when clawed wings gave way completely to feather only wings, but it would be interesting to discover. The claws of Jeholornis are fairly small and appear almost as an afterthought of development, but even this appearance does not make the phylogeny of clawed wings distinctly clearer. Regardless, Jeholornis is a small bird that still resembles a dinosaur in many ways and has, through a bit of luck, been preserved in significant numbers in the fine sediments of the Hebei Province.