Re: T-Rex was..."Cretaceous Poultry™!
As I understand it, Tyrannasaurids probably had feathers as juveniles, but lost them as they gained adulthood. (Much in the same way some birds go from down to feathers.) The idea being that the feathers provided insulation to juveniles, but that as adults their biggest issue was actually how to lose heat, not retain it.
Biting the hand that feeds IT
