b «ok to the ground advertisement of earlier* 
Another fast 1® apparent from wa tching such sales, 
H&% only doe© the possession of a fish cause the sale to be visited 
sere often but fleh~leii .. ee vial ted by a female are stimulated 
to try and get a fish. 
The web of behaviour is further complicated because 
males arc not content to catch fish for themselves* They also 
try to get them from males who have fifth# They use, a© far 
as I ©an see, exes tly the saiae three end behaviour in trying 
to get the fish as does the female# But as goon as they have 
it they at once leave the male and return to their own territories 
to sport their trophy and attract female e and. perhaps , with oetic 
justice, ether covetous males* 
The visit of a female may lead to greeting or, if 
there is ft fifth, to lie presentation to the female, Either 
event ic typically followed by a new type of aerial diiolay, 
the High Flight# This a hare e certain feature* with the 
adverticing flight described before , but seems to do A u&liW tivelf 
different, Unlike the advertising flight the high flight la 
© s -u»l isrformanc© from the beginning '®sa« both ,,irls fly u 
end ascend in small circle© as if they were following one 
another up the same spiral stair-ease# This ascent he© a eclal 
features including the type of flight and the cal la uttered. 
It lasts up to several minutes and then begins a fast glide, 
steep at first becoming shallower a© the birds approach sea- 
level. During the gild# a number of passes occur, as in the 
advertising light, but with a spec:; . difference that the 
male, who initiates the glide and beheves if he were pursuing. 
Is the fltreteh bird in the first few pauses ani lr ter in the 
bent role. The female lias the other role . Ac in the previously 
leseribod pesaee thn stretch bird, fchethor ,-t.. e tfp&alt, follows 
the manoeuvres pf the other while remaining in frent of it. 
It is significant that in epite of the ©ale’s stretch role in 
the first few passes, st the ©ad he has regained the role of 
director, one cannot say leader, of the flight* It is also 
clear that he is much ©ora eager to regain it th> n i© the female 
to relinquish It, Onm again it seems th t th* t befo-viour is aimed 
to test whether the fewole will accent the aale fl a s oendaney 
in determining such matters as where they will fly. If the female 
will not ado it the stretch role the as It separates free, her and 
th® I firl^xf Kwa laiavi^jo n i el i ic g gM ah formation it * 
off# 
i 
It 1® fairly easy to understand in an anthropomorphic 
eons® the function of the various ceremonies which take place 
between ■fcHf ir. One can translate the anturopottorphic 
language into something more scientifically respectable but only 
at the loss of conciseness# 1 shall net attempt to do so 
here but merely point out that one need not presume any understand- 
ing by the bird of the action© which it performs# To 
