Originally posted by Duchess64 http://www.theguardian.com/science/2015/jul/16/zhenyuanlong-suni-biggest-ever-winged-dinosaur-discovered-china
"Zhenyuanlong suni: biggest ever winged dinosaur is found in China"
--Ian Sample (16 July 2015)
Saw that. So it seems to be a forerunner of birds, testing out feather designs.
Size of a mule. It would be pretty ferocious at that size. If it can't fly, I wonder if it could glide like some flightless birds do nowadays.
One of the open questions about evolution is when warm-bloodedness began to develop. Feathers are good insulators, so flightless feathered reptiles may have been able to retain more body heat (e.g., after sunning themselves). Good example of how some feature or function later gets re-function-ed (e.g. for flight).