MIGRATION OF BIRDS. 
©)": OF the strangest things to understand about 
bird life is their annual migrations. We can 
readily see why they leave the north on the 
approach of winter and seek a warmer climate; 
not only because so many | = birds could 
not find sufficient shelter, ~ ~~ but because 
their supply of food is. MS cut off 
_when the insects dis- Wy ~a— appear, 
A few birds like , 
the Chickadee, and 
Woodpecker that 
are not depend- 
the Jay, 
ent on living 
insects for 
== food, remain all 
winter in their northern 
homes; but the “Wgreater number are forced to 
move southward when the frosty nights of autumn 
drive the insects into their hiding places. 
When they go, and how they go, are still subjects 
of mystery. 
A few species, like the Wild Geese and Ducks, 
are sometimes seen flying in great flocks high up in 
the air, but many disappear and no one can tell the 
manner of their flight. Blackbirds, Crows, Bobolinks 
and others collect in large numbers before they are 
ready to go. 
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