Comment on Allosaurus fragilis by TheMorlock
I've also heard that lost plumage can't return, but I'm not at all certain it's true. In birds, there are plenty of examples of species with feathered legs(owls and fancy pigeons and chickens are the first to come to mind). The entire bird group lost its leg feathers ages ago, so the assumption has flaws.
Even aside from leg scales/feathers, in certain fancy chicken breeds the bald facial skin is replaced with feathers. That too was lost long ago, as can be seen with the ancestral species and all the close relatives(prairie chickens, for example), but with freak mutations ended up restored.
So...
Even aside from leg scales/feathers, in certain fancy chicken breeds the bald facial skin is replaced with feathers. That too was lost long ago, as can be seen with the ancestral species and all the close relatives(prairie chickens, for example), but with freak mutations ended up restored.
So...