Declining rainfall is a major influence for migrating birds

Instinct and the annual increase of daylight hours have long been thought to be the triggers for birds to begin their spring migration. Scientists, however, have now found that that may not be the case. Researchers have focused on how warming trends in temperate breeding areas disrupt the sensitive ecology of migratory birds. This new research shows that changes in rainfall on the tropical wintering grounds could be equally disruptive.

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