Editing Feather (section)

==== Structure and use ====
The bone morphology of the radius, ulna, and humerus which support ornamental feathers can also affect female choice<ref name=":2">{{Cite journal |last1=Friscia |first1=Anthony |last2=Sanin |first2=Gloria D. |last3=Lindsay |first3=Willow R. |last4=Day |first4=Lainy B. |last5=Schlinger |first5=Barney A. |last6=Tan |first6=Josh |last7=Fuxjager |first7=Matthew J. |date=2016 |title=Adaptive evolution of a derived radius morphology in manakins (Aves, Pipridae) to support acrobatic display behavior |url=https://onlinelibrary.wiley.com/doi/10.1002/jmor.20534 |journal=Journal of Morphology |language=en |volume=277 |issue=6 |pages=766–775 |doi=10.1002/jmor.20534 |pmid=27027525 |issn=1097-4687}}</ref>. For example, the bone morphology of male [[Club-winged manakin|club-winged manakins]] (''Machaeropterus deliciosus'') is highly specialized, with larger and denser ulnas that are bigger in volume and have higher mineral density compared to others in the manakin family<ref name=":2" /><ref>{{Cite journal |last1=Bostwick |first1=Kimberly S. |last2=Riccio |first2=Mark L. |last3=Humphries |first3=Julian M. |date=2012-06-13 |title=Massive, solidified bone in the wing of a volant courting bird |journal=Biology Letters |volume=8 |issue=5 |pages=760–763 |doi=10.1098/rsbl.2012.0382 |pmc=3440988 |pmid=22696286}}</ref>. The secondary feathers are enlarged and are used in mating displays; males knock the tips of the enlarged feathers together repeatedly in a “jump and snap” motion, producing a distinctive sound. The display ends with a “beard up” motion, in which the male shows off their long yellow throat feathers rapidly while performing jumps.