Although few fine details of the plumage are known with certainty

The Model Pose represents a specimen of Deinonychus stalking its prey

a powerful "thagomizer" composed of pairs of long caudal spines

Approximate measurements of the Tyrannosaurus rex:

Allosaurus fragilis gallimimus Although few fine details ofAllosaurus (A. fragilis, `Different Lizard) was the most common predatory theropod of the Kimmeridgian and Titionian Ages of the Late Jurassic and also the most dangerous. The Allosaurus had a large and robust head with serrated, sharp and curved teeth of between 5 10 cm, which allowed it to tear the flesh of its prey. It also had muscular three fingered arms with claws up to 15 cm long, which helped it hold on to its prey. Its tail was long and