Apodiformes: swifts, hummingbirds and their specialized flight adaptations Apodiformes Apodiformes are an order of highly aerial birds—swifts and hummingbirds—known for long wings, reduced feet, diverse flight styles, and about 450 species worldwide. This article cov…
Aurornis xui: basal bird-like theropod from Late Jurassic–Early Cretaceous China Aurornis Aurornis xui, a basal bird-like theropod from Late Jurassic–Early Cretaceous China, known from a near-complete fossil; its age and primitive features illuminate early avian evoluti…
Avemetatarsalia — bird-line archosaurs (Panaves) Avemetatarsalia Avemetatarsalia, or Panaves, is the clade of archosaurs closer to birds than to crocodiles; it includes dinosaurs (and birds), pterosaurs, and several early relatives that shaped t…
