Wing Molt in Microraptor: This specimen exhibits an active molt in the primaries (the arrow points to the molt-related wing gap). The bottom right inset shows how we identified seven primaries in the specimen’s wing, marked as P(a)–P(g). Based on the molt sequence, one may infer that the long inner primaries are new, the shorter primaries in the mid-hand are growing, and the long outermost primaries are old.
Additional information:
Video: https://www.youtube.com/watch?v=0fgZt0tEyBc&ab_channel=CellPress
Article: https://www.cell.com/current-biology/fulltext/S0960-9822(20)30862-9?dgcid=raven_jbs_etoc_email
Laboratory: https://sciences.haifa.ac.il/new/faculty/nirsapir/