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How do birds migrate long distances with limited energy?
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Bird
A brightly colored zebra finch (Taeniopygia guttata) perched on a branch.
To migrate long distances with limited energy, birds rely on a combination of physiological preparation and energy-saving flight behaviors.
Physiological Preparation
Before migration, birds undergo significant metabolic changes controlled by the endocrine system, particularly the pituitary gland. As day length decreases in autumn, these hormonal signals trigger the accumulation of fat in body tissues, which serves as the primary fuel source for the journey.12
Energy-Saving Flight Strategies
Birds employ several strategies to minimize energy expenditure during their travels:
- Formation Flying: Many gregarious species, such as geese, cranes, and ibises, fly in a "V" formation. Members of the flock take turns leading, while others fly in the wake of the leader to reduce air resistance and save energy.3
- Wind Utilization: Migrants often adjust their flight direction based on wind force and direction. Some species, such as albatrosses, utilize prevailing winds to drift or soar, covering thousands of miles with minimal active flapping.34
- Strategic Stops: Journeys are frequently broken up by long stopovers, allowing birds to rest and replenish their energy reserves by feeding.3
- Soaring and Gliding: Species with specialized wing shapes, such as vultures and hawks, utilize updrafts and winds deflected by terrain to soar, which is far more energy-efficient than continuous flapping.5