 Gihelaunus was a bird species that lived during the early Cretaceous period. It had a diet consisting of both fruits and leaves, which suggests that it was an arboreal herbivore. This transition in the early evolution of birds is significant because it shows that birds were able to occupy an arboreal herbivore niche, which they still do today. Additionally, this discovery provides evidence of the early evolutionary connection between birds and angiosperms. This article was authored by Yang Wu, Yong Ji, Han Hu, and others.