a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur. a semiaquatic, quadrupedal theropod dinosaur.