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Sky's Free Fuel: How Birds Master Energy-Efficient Flight
28 Oct
Summary
- Birds use soaring to conserve energy, a strategy previously underestimated.
- Condors use significantly less energy than swans due to soaring.
- Climate change impacts bird migration by altering wind patterns.
Recent studies have challenged long-held assumptions about bird flight energy expenditure. Contrary to previous theories, birds of the same body mass can use vastly different amounts of energy. Researchers found that soaring birds, such as condors, expend far less energy than flapping birds like swans.
This is because soaring birds effectively utilize atmospheric currents, a strategy that offers 'free fuel' from the sky. Condors, for example, flap only a tiny fraction of the time during flight compared to swans, using a fifth of the energy over the same distance.
While swimming was once considered the most energy-efficient form of animal travel, this new understanding shows that exploiting natural airflows for soaring is cheaper. This efficiency, however, relies on stable atmospheric conditions.
Flapping birds demonstrate greater adaptability to changing weather by adjusting their wingbeats. Conversely, soaring birds are grounded if conditions become unfavorable for flight.
Climate change poses a significant threat to avian energy conservation. Altered wind patterns and reduced stopover sites due to extreme weather make migration more challenging and energetically costly for both soaring and flapping species. This could fundamentally change how and if birds migrate.
