👉 Durnavirales are a group of extinct mammals that lived during the Late Cretaceous period, approximately 65-72 million years ago. These creatures were characterized by their long necks and elongated limbs, which allowed them to walk on four legs for some time. Durnavirales are known for being highly arboreal (tree-dwelling), as they had a tree-like body structure adapted for climbing trees or standing upright on the ground.