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  • Illustration of a four-legged animal standing in shallow water on top of a layer of rock. Caption: Many things must happen for an animal to be fossilized.

    Charles Darwin once boldly predicted that buried deep in the earth are transitional fossils of creatures with intermediate features between ancestral animal groups and the modern animal groups. Since Darwin’s time, many transitional fossils have been discovered, and they provide crucial insights into the origin of key structures and the creatures that possess them. And University of Chicago paleontologist and award-winning author Neil Shubin provides a first-hand account of the painstaking search for the transitional fossil of Tiktaalik, a creature with a mix of features common to fish and four-legged animals.

    (Source: DCMP)

  • Illustration of a skeleton. Arrows indicate the front right toe and back left heel. Caption: Their elongated heel bone and Achilles tendon.

    In this episode, host Emily Graslie discusses the anatomy of various mammals and how they move. Tetrapods generally use three different types of locomotion. Graslie highlights three groups of animals and the science behind their movements: plantigrade animals, digitigrade animals, and unguligrade animals. Part of "The Brain Scoop" series.

    (Source: DCMP)

  • Illustration of a primate standing on two legs. Caption: Ardi is neither a chimp nor is she a human.

    Paleontologists have studied the fossil record of human evolution just like they have done for other major transitions, including the evolution of tetrapods from fish and the evolution of birds from dinosaurs. Sean Carroll and Tim White discuss the most important human fossils and how they illuminate key phases of human evolution, focusing in particular on three traits: larger brains, tool use, and bipedality.

    (Source: DCMP)