Often, the migration route of a long-distance migrator bird doesn't follow a straight line between breeding and wintering grounds. Rather, it could follow an hooked or arched line, with detours around geographical barriers. For most land-birds, such barriers could consist in seas, large water bodies or high mountain ranges, because of the lack of stopover or feeding sites, or the lack of thermal columns for broad-winged birds.
Often , the migration route of a long - distance migrator bird does n't follow a straight line between breeding and wintering grounds . Rather , it could follow an hooked or arched line , with detours around geographical barriers . For most land - birds , such barriers could consist in seas , large water bodies or high mountain ranges , because of the lack of stopover or feeding sites , or the lack of thermal columns for broad - winged birds .
What geographical barriers to land birds try to avoid?
What geographical barriers to land birds try to avoid ?
large water bodies or high mountain ranges
large water bodies or high mountain ranges