Encourage your child's imagination and creative play with CollectA Dunkleosteus Dinosaur with Movable Jaw Brown. Dunkleosteus means "Dunkles Bone" and is named after palaeontologist David Dunkle. It was a big predatory pre-historic fish that lived during the Late Devonian period (around 380-360 million years ago). Dunkleosteus were 30ft long and weighed 3-4 tons. They had hard armour plating, a bulging head, and big, toothless jaws. This hand-painted dinosaur toy looks lifelike and realistic. Designed by experts, CollectA dinosaur models are factually accurate and true to life.