As the full Moon rises, so too does the Northern black swift (Cypseloides niger borealis). When this little bird migrates from the Rocky Mountains to the Amazon rainforest, researchers have found it uses moonlight to regain its energy.
saw the birds lose altitude rapidly, indicating an immediate influence of moonlight on their flight.
"The dynamics of the high-altitude flight in relation to the different phases of the moon came as a total surprise to us,""We discovered that the black swift does not land a single time during their eight and a half month long migration, so they stay in the air the entire time." There's always a chance the birds are flying higher when the night is brighter to avoid predators, not to eat, but the authors note that flying to altitudes of 2,000 meters above sea level on average seems like an"During darker nights, like those around the new moon, the swifts flew roughly 700 meters above sea level on average.
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