Leathery makes more sense than feathers– imagine how much body heat you'd generate if you were 15K lbs (t-rex). You'd want to get rid of as much heat as possibl

Leathery makes more sense than feathers– imagine how much body heat you'd generate if you were 15K lbs (t-rex). You'd want to get rid of as much heat as possible, rather than putting on a thick sweater, or you'd overheat and die.