Try as she might, my dog Hannah never can get close enough to catch a bird. She should take a lesson from the Chinese theropod Sinocalliopteryx.

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The devilish face of Carnotaurus makes it a standout. But this South American predator was even stranger at the other end. I have studied some weird dinosaur tails before, but nothing as bizarre as Carnotaurus.

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The tail of T. rex and other dinosaurs did a lot more than just counterbalance the front end. Dinosaur tails housed a massive set of limb muscles that powered their every step. My work on digitally reconstructing those muscles suggests that dinosaur tail power was much greater than we thought.

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