Iridescent Dinosaur Caihong Discovered in China

In February 2014, a paleontology museum in Liaoning Province, China, acquired a well-preserved fossil of a feathered dinosaur. It was reportedly discovered by a farmer in Hebei Province.
Analysis revealed it to be a new genus and species, and in 2018 it was named "Caihong juji," which means "rainbow with a large crest" in Chinese.

Caihong is thought to have lived in the forests of the Late Jurassic (about 160 million years ago), preying on small mammals and lizards. It was about the size of a duck and is estimated to have weighed about 500g.

The fossil's preservation was so good that Dr. Xing Xu of the Chinese Academy of Sciences, a leading authority on feathered dinosaurs, said he was "shocked by the beautifully preserved feathers of Caihong." It was found to contain traces of feather pigments.
Samples were taken from 66 locations on the fossil and compared with the melanosomes (organelles that store pigment) of modern bird feathers. As a result, long, flat, layered melanosomes were found on Caihong's head, chest, and parts of its tail. The closest match to these were the melanosomes in the iridescent throat feathers of hummingbirds. It is presumed that Caihong's feathers also shimmered with iridescent colors.

Source - National Geographic