Qu'Rall (Allosaurus fragilis)

In case you haven't noticed, this isn't one of my reations, either. It's merely a spiced up Allosaurus.
This wasn't only an experiment with realistic dinosaurian modelling and feathers, but also with fantasy backgrounds. Thanks to the marvel that is indirect lighting, I also had to add in a few extra lamps to make it {slightly} more realistic.
Anyways, this beast from the Jurassic era (to be more precise, 175 to 144 million years BCE) measured in at 35 feet long, 15 feet high and some 3.5 tons. At this point, it was the largest predator for the past 100 million years- and thus of all time. The feathers are really just a speculation, but considering that it evolved around the same time the first birds did, it's not at all inconceivable. This wasn't your average house canary, though. This behaved more like a hawk or falcon, catching prey with its powerful jaws and then tearing it apart with its massive talons. It could run at up to 25 miles an hour, so there was nowhere to run or hide.
Unfortunately, this predator's victory was short-lived. With the arrival of the larger and more deadly Torvosaurus towards the end of the Jurassic, Allosaurus quickly found itself outmatched, outwitted, and- eventually- outnumbered.

Rendered in Blender 2.6
Background created in Photoshop. Pictures taken in Venezuela and Hawaii, and found on Shutterstock.