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. COUNT 4
QSN1 What route does a migrating bird usually follow? ANS1 an hooked or arched line QSN2 What geographical barriers to land birds try to avoid? ANS2 large water bodies or high mountain ranges QSN3 Why do migrating land birds avoid large water bodies or mountain ranges? ANS3 the lack of stopover or feeding sites QSN4 Why do broad winged birds avoid geographical barriers? ANS4 lack of thermal columns