This is the Sarcosuchus (prehistoric crocodilian) action figure from Mattel's Jurassic World Primal Attack line. It features a squeeze/primal attack action feature where pressing the body triggers a chomping jaw motion. The figure is depicted in brown and olive/yellow-green coloring with detailed scaly texture and an open-mouth pose. This example appears to be out of its packaging but the original box is displayed behind it, and the figure appears to be in good condition.
