context: 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.
question: వలస వెళ్ళే పక్షులు పెద్ద నీటి వనరులను లేదా పర్వత శ్రేణులను ఎందుకు నివారిస్తాయి?
answers: the lack of stopover or feeding sites