8-24-2011 EDIT: Removed the green from the head.
Updated version of [link]
which has been moved to my scraps folder.
Deinonychus antirrhopus (counter balanced terrible claw) was a large dromaeosaurid theropod dinosaur first discovered in 1931 by Barnum Brown in southern Montana and published by John Ostrom in 1969. It's binomial name pinpoints two phenotype characteristics of dromaeosaurid theropods. These dinosaurs, known informally as "raptors," had long, stiff yet surprisingly flexible, tails to keep them sturdy when active. This suggests that they were fairly agile creatures. And dromaeosaurids also had a pair of unusual retractable claws on their feet. These so-called "sickle claws" were initially thought to be used as offensive weapons in taking down large prey. In fact, dromaeosaurids such as Deinonychus are commonly depicted taking down large herbivorous dinosaurs with these claws. However, more recent studies reveal the sickle claws of dromaeosaurids to be fragile, unsuitable for using them in violent combat against struggling prey. Studies on dromaeosaurid biomechanics suggest that these claws were instead used to maintain an arboreal lifestyle, enabling the dinosaur to maneuver through trees (as demonstrated in my illustration here).
My illustration here is a fairly basic interpretation of Deinonychus. It is fully feathered as is now accepted in the scientific community. I tried to be original yet realistic with the coloration.
I referenced images acquired via Google Images for this illustration, no copyright infringement intended.