The holotype of <i>Microraptor gui</i>, IVPP V 13352 under normal light.
This shows the preserved feathers (white arrow) and the 'halo' around the specimen where they appear to be absent (black arrows). Scale bar at 5 cm.
David W. E. Hone, Helmut Tischlinger, Xing Xu, Fucheng Zhang
CC BY 2.5
Hone DWE, Tischlinger H, Xu X, Zhang F (2010) The Extent of the Preserved Feathers on the Four-Winged Dinosaur <i>Microraptor gui</i> under Ultraviolet Light. PLoS ONE 5(2): e9223. doi:<a rel="nofollow" class="external text" href="http://dx.plos.org/10.1371/journal.pone.0009223">10.1371/journal.pone.0009223</a>