30 
It is not easy to advise measures either for increasing the numbers 
of this bird or inducing it to take up its residence on the farm. Nat- 
urally it inhabits thin, open woods or groves, and the change from such 
places to orchards would be simple—in fact, has already been made in 
some parts of Pennsylvania and Ohio. In New England the bird is 
somewhat rare, and perhaps the best that can be done here or elsewhere 
is to see that it is thoroughly protected. 
THE SWALLOWS. 
There are seven common species of swallows within the limits of the 
United States, four of which have, to some extent, abandoned their 
Fia. 16.—Barn swallow. 
primitive nesting habits and attached themselves to the abodes of 
man. As a group, swallows are gregarious and social in an eminent 
degree. Some species build nests in large colonies, occasionally num 
bering thousands; in the case of others only two or three pairs are 
found together; while still others nest habitually in single pairs. 
Their habits are too familiar to require any extended description. 
Their industry and tirelessness are wonderful, and during the day it is 
rare to see swallows at rest except just before their departure for the 
South, when they assemble upon telegraph wires or upon the roofs of 
buildings, apparently making plans for the journey. 
