Jurassic Porcupine

    In late Jurassic Africa, a pair of Ceratosaurus are attempting to close in on a lone Kentrosaurus but are unable to strike as the med-sized stegosaur curls up, protecting its unarmored belly and swings its spiky tail back and forth, preventing the predators from making a kill.
Setting: Tanzania, 150,000,000 B.C.