It is the third to be found, but the first one that has...

It is the third to be found, but the first one that has shown feathers identical to the ones in modern birds. They were probably present on some of those in the past, but the feathers weren't preserved well enough to be able to see the fine structure. On this latest one, feathers are found all over the fossil, and they are best preserved on the back edge of the forearms and hind limbs.