Horsetails

combined with a hydrodynamic body

as the distinction between ontogenetic variation and actual taxonomic differences in tyrannosaurids is complex

Its highly specialized morphology has been the subject of intense debate surrounding its trophic ecology and behavior

Although the skull is not fully known

Boreopterus Troodon HorsetailsBoreopterus is a genus of pterodactyloid pterosaur from the Early Cretaceous (BarremianAptian, around 125 million years ago) , known from well preserved fossils in the Yixian Formation of Liaoning Province, northeast China. [turn0search1][turn0search2] It is classified within the family Boreopteridae , a lineage closely related to ornithocheirids, characterized by cranial and dental adaptations that suggest a piscivorous lifestyle . The skull of