44 
ROUTES OF MIGRATION 
Porto Rico from the westward. This route, however, is followed by 
only a small portion of the birds which migrate southward, through 
Florida and the Bahamas, into the Greater Antilles. If they continue 
their journey to South America, most of them do so through Jamaica, 
the 400 miles of water separating this island from northern South 
America through the Greater Antilles and Central America. 
Dotted area — Breeding range. Black area — Winter range. Arrows — Migration 
route. 
America being evidently no barrier to such great travelers as the Bobo- 
link and Blackpoll Warbler. 
Within the limits of the United States, coast-lines, mountain 
chains, and the larger river valleys, appear to be followed by birds 
in their migrations; nevertheless, there is a more or less pronounced 
