Please enjoy this video examining the Pelagornithids, a once highly successful lineage of seabirds that developed into the largest (although perhaps not the heaviest) flying avians to ever live. With a complex mixture of anatomical traits that have make them difficult to classify, the Pelagornithids thrived until the global climatic upheavals of the Late Miocene and Pliocene. With their large size and probable slow rate of reproduction, these birds died out by the Early Pleistocene.

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