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2 ywaag of age 2 *■<«*© left exchanged with 2 young oi 
t? ^ -- -< g ** f| 
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"1 fo ,r vert reared b;> ti a far. tor parenta. 
a far the eyeerimeeata have only tested the reaction of adult© to 
etraage shk ^ Are behaviour of the ohiofce rceanelvee to si-rangn mstumitm 
io a?, a-? ia*% Ta & brood of 2 young of the 4th a»;e group, one duick vm 
roplaoei by a sera ager of the saise age. ago etraase chick waa oli ^itly 
■ than the rreoa&sliig Stas Mi sual tfe rre 
oat ire aftoka did -ncK get on together, it first joth ^owi? n-oureco. far 
a -i»ir>T® of '.slnutes, 'ffcen tl t. owraar ohiok lifted its head at whiah the 
•r, 
•on the oust ed its?- 1 away fro® the stranger and the attaok. 
;.f, S, , started ©gain as too i na ti® owner lii-cea j.t& bred. lit: 
P-re- •.». p‘re rso at-*x> it ion to Use qnjnredlag ,.K]f 4 few asr© ox p«r baa- ita 
Mo. *:e:u .refe for a. different reason also suggest taat ^i.uoxsi kxm* i .sir 
broth -ros eirl £f; ?.ter, e *. tb was elwa-s t}.» larger jisung who world attack the 
'svitv-j aheiiva* h& tim in hie own neat or not, 3 to r»ofe know at whet age 
Aids Pore;ip.tx an icar® n*s no ©xparia^nts for this our x>se were i^le. v.Ac 
at Jiiefes in which I saw t wre fay* old, Twice -served boar a 
tJirae day ole chick wandered into a strao e neat and wa® aouegstod by toe 
©octtoyyag ilici. :.a vsho we then under seven. days oM, l'hX» »,ug r sata that the 
, 'I;.:! '1 to re oo-,.niae eafi offer i.aen they are ebowt a m®k old. 
, - is aii*ficult to laagi ne i^hat function tbto recognition nay have, 
esneolally no 11,-3 adtdt® have lost it An evolution, i can oo3 v- euggeet 
teat 5,t e-.a;,: .o l,-eeorfs,nf in aom etifion over food. Brood listers w>«o ait 
in 'jenoo fo.;-.l'aor iihlf tl* day will middenly start to quarrel when -w-c food 
cores. Ba a ’iirootl of two yotxag both oiiioka, etfeiding on either ai.;.-c of the 
jjaront, mw e:f f !j olom to puemt’a beek, but the larger young m.jreasea 
its ohiBioe of getting tho fbod by ;vevj»kir^ at its tolter ne*t iittte. One 
viaioua ix>ck at the beak or into thn f«noe suffice© and the smaller young 
