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[[File:Eesti rahvuslind.jpg|thumb|A barn swallow displaying {{gli|tail streamers}}]]
{{Term|tail streamers|content=tail streamers {{anchor|tail streamer|tail-streamer|tail-streamers}} }}
{{defn|The elongated, narrow tips of the {{gli|tail}} that are seen in some birds.<ref name="MollerBarbosa1998">{{cite magazine|last1=Mo̸ller|first1=A. P.|last2=Barbosa|first2=A.|last3=Cuervo|first3=J. J.|last4=Lope|first4=F. d.|last5=Merino|first5=S.|last6=Saino|first6=N.|title=Sexual selection and tail streamers in the barn swallow|magazine=Proceedings of the Royal Society B: Biological Sciences|volume=265|issue= 1394|year=1998|pages=409–414|issn=0962-8452|doi=10.1098/rspb.1998.0309|pmc=1688894}}</ref> They generally function as a [[Biological ornament#Sexual selection|sexual ornament]].<ref name="MatyjasiakJabŁoński2001">{{cite magazine|last1=Matyjasiak|first1=Piotr|last2=JabŁoński|first2=Piotr G.|title=Hypothetical mechanisms of the initial evolution of sexually dimorphic tail streamers in Hirundinidae|magazine=[[Evolution (journal)|Evolution]]|volume=55|issue= 2|year=2001|pages=446|issn=0014-3820|doi=10.1554/0014-3820(2001)055[0446:HMOTIE]2.0.CO;2|pmid=11308101}}</ref> In the [[barn swallow]], this has resulted in the tail streamers being {{convert|12|mm|in|abbr=on}} longer on average than is aerodynamically optimal.<ref name="Buchanan2000">{{cite magazine|last1=Buchanan|first1=K. L.|title=The effect of tail streamer length on aerodynamic performance in the barn swallow|magazine=Behavioral Ecology|volume=11|issue= 2|year=2000|pages=228–238|issn=1465-7279|doi=10.1093/beheco/11.2.228|doi-access=free}}</ref>}}
{{Term|talon|content=talon {{anchor|talons|claw|claws}} }}
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