Archaeopteryx is an extinct bird which has 2 reptilian and avian features
avian features - Feathers r the main feature of modern birds. This is one of the main criterion for classifying Archae as a bird, as no other modern animal has feathers. Furcula (wishbone) formed of two clavicles fused together in the midline.
reptilian feature -Bones are pneumatic ((((((((( have air sacs))))). Pubic shafts with a plate-like, and slightly angled transverse cross-section