The Long Way South
How migrating birds find their way across the world
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Wren: 32 min · Hollis: 36 min
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A ring with a seven
bird ringing, migration
The light going early
photoperiod, Zugunruhe, circannual clock, clock-and-compass
The still place in the sky
sun compass, circadian clock, Emlen funnel, star compass, polarized light
A night with no stars
magnetic field, magnetoreception, inclination compass, cryptochrome, radical pair
Which way, and where
stopover, displacement experiment, map-and-compass navigation, landmark, site fidelity
Goodnight, Seven
the wind-down