144 THE BIRDS OF EASTERN NORTH AMERICA, 
Bill, small, flattened, and somewhat triangular in shape, the gape very wide; wings, very 
long, usually extending beyond the tail. (Chim- 
ney Swifts, which belong to a very different 
family, are often mistaken for Swallows when 
seen flying about; they are smoky black and 
the shafts of the tail feathers extend in spines 
beyond the webs. See next Family.) 
Swallow. Martin. 
Family HIRUNDINIDAZ. Swallows and Martins. 
See page 265. 
Plumage, smoky black; shafts of tail feathers, extending beyond the web in sharp spines. 
Sometimes mistaken for Swallows by persons unfamiliar with birds. 
Family MICROPODIDAZ. Swifts. 
See page 199. 
se 
First primary, about half as long as third; eae 
. 7 BANSAN 
feet, zygodactyle (toes, two in front, two be- Ss 
hind); outer tail feathers, very much shorter ke 
than middle feathers. 
Family CUCULIDAZ. Cuckoos. 
See page 188. 
