- 5 - 
»u tehing, which e&uici all the ah- <5 a difficulty in li. nding. A 
female was tlM« on the ledge whan her mat* came in to alight 
but hi** touch-down was rather unbalanced owing to acme alight 
#4dy. At one# hi a sate peeked at him and he fell off and had to 
circle once nope* This time hie a roach and landing were 
foul ties a and there was the normal greeting exactly as if there 
had been no hostility at all between the®. Further evidence 
that the nates can still be hostile towards on® another la 
shown by the fact that after a male has driven an intruder fro* 
his territory, he may bo so enraged that he even attacks his 
own mete, Indeed there are Indications that far from a decrease 
f\ In aggressiveness the female's initial fear of the male is 
« replaced by a slight- aggressiveness towards him by thy t . 
eggs are laid. 
When another shag lands near the ledge where a male has 
his territory e threatens the a rrlv® 1 usio one of severs 1 
stur^s. if v arrival le a regular occ t of the ledge the 
threatening may die down quickly, but if It it a stranger the 
threatening male may launch an attack on the ledge if it is within 
hoppinr is mass of his own. Such observations as these show 
that not only do the birds learn to recognise their mates but 
■w the other habitudes of the c nave not been 
> decide whether voice plays a part in recognlti 
as the appearance but this may be so. The personal likes 
and dislikes of the members of a colony can be very striking. 
For example in 10*54 there were four pairs, K,L,S and N, who 
resorted regularly to four neighbouring ledges. Of these airs 
L and M later bred suecee fully and gave the impression of log 
fully mal re. In contrast to the other two pairs whose courtship 
and nesting wi&t mors insomplete. Of the >air N,who were in 
any case only weakly bonded to one ma ther, the male, Me s tor, 
showed a strong attraction for tie ferrate if .-air L, Lottie. 
ienever Lottie’ ate, Lender, left her, for emample to bathe, 
Hester would fly fro® his ledge and even leave his own fe 
to visit her. The female would not tolerate hi® and as she was 
not able is drive him off she -invariably left as Use tor aoorsashsd* 
Leafed* r quickly learnt that this would ha open and as he flew 
out he would repeatedly :>sen over his shoulder. If he saw Nestor 
leave ledge N he would wheel round and return to drive off the 
usurper. Sometimes Nestor would return to the colony after 
being away for an interval and find Lottie alone on her ledge 
and fly to her. As usual she left and he would then start 
advertising vlgeurously on her ledge. There were several 
undated femles who hung about the cliff and visas would fall 
over one another trying to get to hits but "he would peck e&cn 
away. Lottie, who® he seemed to want to a ttract, might land 
elsewhere on the cliff and peer down at him but show no sign 
of wanting to go to hid* His own female, Nellie, also showed 
no sign of w oting is visit him but was mors interests' in the 
rale of pair If, though the latter would not tolerate her for 
wore ■ 0 few seconds before peeking her away. Thus the 
arrival or departure of a particular individual might »V*rt a 
