17 
DISCUSSIOH 
It i: unfortunate that I could no t tsx the birds to decide 
whether, Hbo i the r gulls and terns. It 1 > the icales which tsbe 
*J tl+c I'Mi****} $t*M\ to **9^ 
up tcrrt. to rise c tty ®t ' • maj Oti^bat 
all that la certain i* tb * t ons of the metre does most of the kbx* 
£tx% bridling, Is more active $ aver filly in ca rtlrig end, In those 
be*. 
i a Uneci -..tien I hr vc: ccsn It, fc is the tier, la other Lar 1 Is 
It Is the n le -I'd } uauu 1 ly f v?du the female .* n 1 is cere active 
in courting, so that this would lead one ox act that the same 
obtain!' in the Blacl Noddy. This view is? confirmed by a slight 
size difference ao- u stipes Cetoctabl ^ 'x. tvec.c tac sa te3 , ax£K On 
noted 
all si x occasions when I yt uT^l # ■■ X ; -e, ST 1* a difference. It was the 
larger bird which did r.oro of the bridling, “’lug measurements of 
eVins in tho British Museum, ♦ . . • 
. -'• -• '_•••_ 
Although tA - ibr l.' net, set tie’ yet, it as ?? c lively tA' ■ t its 
feed a and does tan re of the bridling etc. 
. t 
ix fefexw otfe x *: ■ :£«as -rv « r 
L in* 
On th* - ft) ositi on about, the aexe«, the course of calr 
» 
formation seems to be rs follows. The male occupies a ledge 
_ . % -j#b* (h* tTM i m 1 1 1 II^T^ P^^BB I^K r - ,.«; 
i. ^ he defends against intruders end bridles there to attract 
females. 1: 7t ~n female bib bM-.d ? hi s the .n r display together, 
- ^ 
the disci.. / a laalu' 1 ing an cc which arc * a cn during hostile encounters 
*• *“ »»? •»«•* Oir-J 3 , tee • * 
rr.l. *ad with hi* die play ?• towarls the newly arrived f e’jic 1 * , and 
4 V 
she t - o y w> xw bn easily alarmed by him Tho is ’•l ay flight, 
involvi cooperation of both ia r t rs, presumably cements the 
'■>air bond firmly and after e tlxe the .ulvtrl dis rust i?ufe3idsfl 
