the oblique of gulls sad the oorrea uoauing posture of Sterna. . 
Tb« cs 1 7 pirn la this eoature 1 j ^ruca less :i ulsr when 
compared In t It has the infectious .j-j-i 1 1 ty of trio long go 11 
of at least gulls (Herring, Lea er Block Beck, Fitfciwake) . 
Like the obit iu® • • -id 1 ong c 11 ttu oron’. is uttered in agot 
i/. 0 
Si tuf* tlons , thru/-; . tUlo ; q.Xios l :■ several other calls too of OOurs 
It wwT.i thu r nevo. clou cl bio the t the croak ic homologous to 
A > stars of gulls in# the equr lent 
of toms, but the matter is by no means certain. 
The arid ling is of particular interest as it Is a 
■ - . , rhyth ale he end n e< ' 
Toven '-nts are roffilniacent of the choking of culls, 'f hi a re ambiance 
is increased by the r s ture of tin? body "«i U ; the breast slightly 
1 -V ■ >r<v! , A rhythmic choking -like c is clay ■ has not boon described 
* : * - r - •*-■•' '*- -• gu '■ "• ‘ -r ■ . * " ' . 
. . _» 1 . _i : - z . • - . . "• -J, ▼ _ > ... _ 
in any other apecios of cm but this would bo in Hue with one 
■ 
m~ ' / k'/ 1 . ^ ■ y*.. 
view of the derivation of oho’; ing, wk i oh is t . i It lr. a ritual iso] 
reduplication of the movement by which a bird drops a load of 
y‘> p * jfef ' '3 A v ; ji (W si* 
nest rate rial. / art from the Hod dies, no ether tern, is known to 
V * 
‘ neat’ mate rial from a diut- iso; wo~‘: - u-r 
‘ • -* ’ ! ' ' - 
l ►*«p\ i’ • ' jk *z ■ ’ *_ -wQ . w^. « 
• 1 ■ - is picked up i piece at a time as fc ? bil -* sit, 
cr walk to and from their nests. 
If the bridling has originated from too some source 
f t . i ' o 3 ir in sever 
■?. n u- tip tt. I;-; Ai( c i i' -r the- eahaniOAlly-produaet 
snap of the closing beak } , l&okl 1 'U id 
th rougher t the gulls. Secondly the regular opr i v ; and closing of 
the beak la rulte unlike the choking of r.ny cf the- k?io.m gulls. 
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