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CARPENTERS, MASONS, AND MINERS 
I have, however, seen them rise from the 
chimney top in first flight with the adult birds, 
and, except for their size, there seemed to 
be little difference. With a strength and 
surpassed by any other 
bird, the adults rise, circle, and soar for 
hours early in the morning and through the 
dusk of evening, entering and leaving the 
chimney in companies with a queer rotary 
motion. During the middle of the day 
they hang, bat-like, on the side of the wall 
supported by their claws and short spiny tail 
after the manner of woodpeckers on a tree 
trunk. 
Eave-swallows present another curious 
instance ’of a change in the nesting-habits of 
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