RKFLKXKS. INSTINCT, AM> HK.MiOS 



4U 



one in the .specializatirwi of Ijinls ami mainuiai.-,. W i.en tl»e 

 young are cared for the jxTcenta^^e of lo.s.s in llu- str ' for 

 life is greatly n'(hice(l, the niinilM-r of ])irths iieeeHSiirv lo ihc 



Fivi. 274.— Nebt and fK^s <»f tlu' Uiifiis huintniti(;Mr<l. 7V. 



J. O. SiiydiT, Stanford I'mvcr-^' v f ,,...- 



l'li»(<itf r»i'U hy 



iTiaintenanee of tlie species is much less, and the op|>ort unities 

 for specialization in other relations of life are nnich proator. 

 In these regards, the nest-huilding and honio-niakinp aninv^^*^ 

 have tlie advantage over those tliat have not those iiiiJtinc;.-. 



