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Hans-Dieter (Hans) Sues is a vertebrate paleontologist based at the National Museum of Natural History in Washington, D.C. He is interested in the evolutionary history and paleobiology of vertebrates, especially dinosaurs and their relatives, and the history of ecosystems through time. A former member of the National Geographic Committee for Research and Exploration, Hans has traveled widely in his quest for fossils and loves to share his passion for ancient life through lectures, writings, and blogging.

Big! The Life of Sauropod Dinosaurs

The last four decades have witnessed a revolution in the study of dinosaurs. Scientists no longer examine just the structure of the skeletons and the relationships of these fascinating animals, but have started probing issues of their biology. How did dinosaurs move? How did they feed? What was their circulatory system like? How did they…

An Earful of Jawbones

The middle ear of mammals contains a chain of three tiny bones (auditory ossicles), the hammer (malleus), anvil (incus), and stirrup (stapes). This chain transmits and amplifies sound vibrations from the eardrum to the inner ear. The eardrum (tympanic membrane) itself is stretched across an additional bone, the ecto­tympanic. In all other land vertebrates, a…

Exploring the Realm of Senses in Dinosaurs and Their Relatives

In recent decades paleontologists have been able to document in ever-greater detail the evolution of birds from small predatory dinosaurs. After establishing the broader outlines of this transition, researchers are now focusing on specific adaptations. It is widely believed that birds have no or at most a poorly developed sense of smell. A new study…