INTRODUCTION. 15 
often extensive, enabling them to change their residence annu- 
ally, until they are finally driven away. Cat-birds frequently 
return every year to the same thicket, and I have known the 
Red-eyed Vireo to build his nest in the same tree where it was 
built and robbed the year before. Likewise Pewees very often 
choose successively two or three building-sites very close to 
one another. The less familiar species are not so attached to 
particular spots, but generally build their nests each summer 
in the same tract of land (a tree-warbler in the same woods, 
etc.). Hawks (and occasionally even crows) become attached 
to a certain grove or pine-wood, and build near the same 
place several years in succession, sometimes though repeatedly 
robbed. Woodpeckers (who always lay their eggs in holes) 
do not usually, so far as my observations have extended, 
occupy the same holes twice, but leave them to be used by 
Chickadees, or other birds. Feelings of attachment are much 
stronger in some species than in others, being often nearly ex- 
tinct. They are more marked in civilized districts, where 
there is less range of country than in other parts of the State. 
Many birds forsake their haunts, if disturbed, but apparently 
return sometimes after a long absence. The evidence of 
identical birds returning to the same spot is very strong, par- 
ticularly in the case of individuals peculiarly marked. 
§O. There are not many birds, who, in a temperate climate, 
do not habitually raise a second brood; and there are probably 
very few, who do not do so, if the first is broken up or de- 
stroyed. They rarely raise the second in the same nest as the 
first, but generally build another (often hurriedly) near the 
site of the former, particularly if that has been disturbed or 
removed. The principal exceptions to this latter statement 
