Scientists have long wondered: why do birds go through the hardships of migration year after year? Today, they face special challenges. Billions perish every year while migrating, dying of hunger, thirst, exhaustion and environmental poisons. Others fall victim to hunters, predators, windmills and power lines. There is hope, as we learn to admire and appreciate their incredible determination.

Scientists have long wondered: why do birds go through the hardships of migration year after year? Today, they face special challenges. Billions perish every year while migrating, dying of hunger, thirst, exhaustion and environmental poisons. Others fall victim to hunters, predators, windmills and power lines. There is hope, as we learn to admire and appreciate their incredible determination.