Deinonychosaurus is not a valid name for a dinosaur.
It is a misspelling of Deinonychus, a genus of dromaeosaurid theropod dinosaur that lived in North America during the Early Cretaceous period, about 115–108 million years ago.
Deinonychus was a bipedal, carnivorous dinosaur that had a long, stiff tail, a slender snout, and a large, sickle-shaped claw on the second toe of each foot.
It was about 3.4 meters (11 ft) long and weighed about 73 kilograms (160 lb).
It had a coat of feathers covering most of its body, except for the snout, feet, and tail tip.
The color and pattern of its feathers are unknown, but some scientists have suggested that it may have had dark and light stripes or spots to camouflage itself in the forested environment.
Deinonychus was closely related to other dromaeosaurids, such as Velociraptor and Microraptor, and to the earliest birds, such as Archaeopteryx.
It was one of the first dinosaurs to be recognized as an active, agile predator, thanks to the work of paleontologist John Ostrom in the late 1960s.
Deinonychus is also famous for its association with the herbivorous dinosaur Tenontosaurus, which it may have hunted or scavenged in packs.
Here is a summary of what Deinonychus looked like:
A bipedal, feathered dinosaur with a long tail, a slender snout, and a large claw on each foot
About 3.4 meters (11 ft) long and 73 kilograms (160 lb) in weight
Lived in North America during the Early Cretaceous period, about 115–108 million years ago
Closely related to other dromaeosaurids and to the earliest birds
An active, agile predator that may have hunted or scavenged Tenontosaurus in packs