They admitted that despite Gigantoraptor being a member of the Oviraptorosauria , a group that includes the feathered species Caudipteryx and Protarchaeopteryx , it might have been `` naked '' because it is three hundred times more massive than these species , and very large animals may rely more on mass for temperature regulation , losing the insulating coverings found on their smaller relatives .
Very large animals rely more on mass for temperature regulation , losing the insulating coverings found on their smaller relatives .