* 10 - 
occurred at rands* m# night still sx *ct that occasionally they 
«t«ht h* :>:.*« in sucto isicfc .luece-moa but the fre-pionsy with 
which X aaw It ruled out this of »ero chance# Th?*re 
wa# cleanly sose Hind of osusal connection between the two 
ViVMIQW* Bath -aa- h'.-i In ami rpr ~«u; 
p tied rather above the honl'rmt And hen evened, There 
seessd a sinil&r Hind of saunal connection between. twe other 
wevesemtsi daffeoeabieii nmi both wings stretch. In the first 
the body Is tilted feiwwvn&s am the tt.ll m iwid * in the second 
both these things happen 'but also the nu»ek is stretched out 
In a peculiar twiner nnd both wings are raid* 4 above the b ok 
though usual ly net unfolded# The both*wtngs~&ireteh posture 
o court* in noat, If not all, sneete* of birds but th»* dot nee* ticn 
posture te sore variable in forts in different a rm cine , 
Instead of the typical defaecatlott posture X sow that a shag sight 
often ado st the beth~wlii'X4“»« tr«teh posture when u«.;> tm» ting* 
either at the tine or a few seconds later# 
in both examples given the iim l>.§ tween the two postures 
wsufcft whies sees to >*** connect -d in the fort.! of the ftcveuent. 
The adopting of the one pcssturs see&ed itself to serve a® a 
stiaulus for the >ther to fellow* There was even sou© evidence 
tnt t there ase a reel pro o ,j 1 effect# Mat only would the ti;nm rd 
a sp idlMs stretch but .he upper nandiblo 
stretch would stiwulnV* the u ?r**rd gaps* The hypothesis Is 
that the ■■■■' turn ■of the birds, y the actual deleft 
a- 4 ;*: ■■■ . then mm any influence th© immediately 
subsequent bebavi the bli U It ■ - ■ mmi 
determine the nature of a die -If ement activity# Indeed the 
exasplos I have Just cl tel night be sailed displs.eenNrnt activities. 
The vfing- flapping In fcfea &iv* riisinfc die Asy of &h* cnin^m-nt 
has f? ready iti med* me hi any r etlen 
at all ae to Its origin and before attempting to Bo so on 
wust consider the ooveuent were closely# 
! i * > 
The wing; tip is raised upwards while the carpal 
Joint is hsrily brought, out of the sur porting for- them# This 
i*> achieved by e rotatl on of t' - - h* scents* How this rotation -a 
a e cult ftp one *•« far a? X ©n nee os ours in only one- ether 
nl tur tlou in v cormorant's norr^-l lifei wh» ,; ?u it mptn.r to «aH 
a bo fh~ *»Vngi»~« ire fceh# In. the advertising display the sale 
eernor&ut ic in & eonfllet situation whieh* in a gi ■ ussy 
species* is known to result in die pis oesaent activities# I 
t it pos ible that the ©hoi e 1 splat "it activity 
ay have bees doterulned by the poets re in which the bln was 
»t the tlae, the forward posture# fhLy recjulre » on*, to supaoee 
ot the fervor! posture is elder In evolution - , ne 
flapping b»it this It not rontrtdiotel ty the ft* facts c-vaiirble 
t the atouent* Chiee the dlsplace’sent wing*** tre teb was likely 
to occur the further prooeas by which ihu ruytiule mi sing and 
lowering of the wings was evolved mist h&ve been due to eov# 
bind sf t- ■t.fmtion > a word- which dsss UiUf except cloak our 
ignorance but it would he eosethlng If the first step mv® accounted 
for# 
