Jurassic Park: Archelon
Archelon was a giant sea turtle from the Cretaceous period, so far the biggest of its kind. It was 4 meters (13.5 feet) long, and about 4.87 meters (16 feet) wide from flipper to flipper; 5 ft bigger than the Pacific Leatherback sea turtle.
Code Name: Archie
You are looking for a bison. BYOP. Happy Hunting!