The Polacanthus, whose name means "many spines" was a quadruped of the family of "nodosaurids" living on Earth 132 to 122 million years ago. He was 13 to 16 feet long and his body was covered with two rows of thorns on his back, and many triangular plates at the tail, giving him real armor against the most ferocious predators! Measures approximately 6.9" x 2" x 2"