Volume 20, 1970 - The Arctic Circle - Home

u3 \ .\\Nt1 'z\\s "\\Figu;'e l: Dravri.ngs of a sequence ofphofoeraphs of a f'lig.hl song display. From LefNto right the rrale qlicies upvrard. iJote fhesurprisingly lonii wings, the widely farrned tail andthe feet l-reld forr arci. I'Jear the peak of the upvrarri glidefhe Soi:.{ '.;egins, ancl fhe throal bulqes. As sfa}Li-nq speedis reached tl,e neck is bowed dovnrward atrd tite back of fheneck bul-res. 'i'he fail i.s cieei,I./ keeled while the lateralretrices !rre al:nosf horizontal r^nfh thc lrai.ling edge of fhewing-. ihe parachr.rtj-np rlescenf curves fl.'e laferal retricesupurard while fhe central ones aTe strll Lrelri d-ov'ni, a.nd thetur.bulerrce raises f|e pl',rmage on the bir"lts back. The taj-I is thenflatterierl as tlie bodrr noves info a more vertical position and withrisirrq rnornentum the bird can agerin g1r.cie as the second splutteringpart oi' tL,e song is clelivered. After ali-ghtinq lhe tail is tippedupr conspieriouslX rnarkrng the malets positi-on. This noverneul isfollorrred by a qrcund vocallzation v;Lrich also atfracts attention tohis locati-on.