GREY BREASTED !\IART1NS 841 



they are his proper food, because he has so been fed from 

 the time of hatching, and he finally learns how to catch them 

 only after instruction by and imitation of his parents. 



Tliese observations show, in this bird at any rate,- — 

 though prol)ably in many othei's — that certain habits liave 

 been acquired, due to the protection afforded by the advance 

 of civilization which, if the bird were transplanted from civ- 

 ilization to ancient conditions, would be of great detriment 

 to it. These newlj^ acquired habits dominate its natural 

 instincts. 



