Longest non-avian dinosaur feathers

Nowadays, birds (avians) are officially classified by palaeontologists as living dinosaurs, with all prehistoric dinosaurs being referred to as non-avian dinosaurs. The non-avian dinosaur with the longest feathers was Changyuraptor yangi, the terminal feathers on its tail measuring almost 30 cm long. This is approximately 30 per cent of the length of this species' entire skeleton. It existed approximately 125 million years ago during the early Cretaceous, in what is today China's Liaoning Province.

Interestingly, this species – currently known only from a single near-complete specimen the size of a turkey and formally described in 2014 – is only the second-known species of four-winged microraptor. That is, both its forelimbs and its hind limbs bore long true flight feathers, and it is believed that it was able to fly.