And from time to 
time, as it darts == 
to and fro, it 
utters its loud, screaming cry, which is quite 
=") unlike the note of any other bird found in 
this country. 
Swallows and martins, too, frequently 
rest upon the ground. Swifts, however, 
never do this, and it has even been asserted 
that if they are placed on the ground they cannot rise into 
the air, owing to the weakness of the legs and the great 
length of the wings. But this statement I have disproved 
by actual experiment. 
