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Description
Second part of the Deinonychus's revolution. For the first part read and see Sketch-Featherless Deinonychus.

Part 2
Here there is little to add.
I preferred not to put a bill on the animal because we have no proof, and it's much more likely that the mouth was covered with some callosum-like skin because we have no evidence of animals having both beak and teeth, 'cause that's a wrong popular belief (this was inspired by Martyniuk's post on Hesperornis on his blog DinoGoss). Since Deinonychus derived from tree-dwelling forms and / or almost-flying, mostly gliding little maniraptorans, it can be considered as a secondariary flightless form, so it could have got a plumage simplier than more primitive relatives like Microraptor, like something not very different from today's feathers of ratites. The areas without feathers are mostly hidden, and would be exposed only when the coelurosaur needs to regulate body temperature. These areas are: throat, belly, the armholes-region, hind legs, pelvis and under-tail.

I'm hoping I didn't say a lot of cr*p.

Thanks very much to that genius of Martyniuk, a true esponent of the paleo-art's revolution!

Description
Second part of the Deinonychus's revolution. For the first part read and see Sketch-Featherless Deinonychus.

Part 2
Here there is little to add.
I preferred not to put a bill on the animal because we have no proof, and it's much more likely that the mouth was covered with some callosum-like skin because we have no evidence of animals having both beak and teeth, 'cause that's a wrong popular belief (this was inspired by Martyniuk's post on Hesperornis on his blog DinoGoss). Since Deinonychus derived from tree-dwelling forms and / or almost-flying, mostly gliding little maniraptorans, it can be considered as a secondariary flightless form, so it could have got a plumage simplier than more primitive relatives like Microraptor, like something not very different from today's feathers of ratites. The areas without feathers are mostly hidden, and would be exposed only when the coelurosaur needs to regulate body temperature. These areas are: throat, belly, the armholes-region, hind legs, pelvis and under-tail.

I'm hoping I didn't say a lot of cr*p.

Thanks very much to that genius of Martyniuk, a true esponent of the paleo-art's revolution!