Sky sense

The Bird That Flew at Night

How does a small bird cross a continent in the dark?

Generated interpretation

Stars wheel around a hinge in the sky. The pattern is the clue, not a single named light.

Listen, or read

The words

Some birds travel at night. The land below is dark. Overhead, the real sky still turns. A bird can learn the pattern of that turning. She is not reading a map with names. She is keeping a heading through a sky that moves.

Some birds travel at night. The land below is dark. Cities make their own false stars.

Overhead, the real sky still turns. A bird can learn the pattern of that turning.

She is not reading a map with names. She is keeping a heading through a sky that moves.

What we know

Evidence, held lightly

We know

Some songbirds orient by the rotating night sky.

Many night migrants also use a magnetic inclination compass.

The evidence suggests

Cryptochrome in the eye is the magnetic sensor.

We are still figuring this out

Whether the field is seen, felt, or both.

We do not know yet

How a first-year bird, flying alone, holds a route it has never flown.

Try this

Try with a grown-up

Look up after dusk

Find a darker patch of sky than your street. Watch one bright star for a few minutes. It will drift. That drift is Earth turning. Night birds learned the whole pattern of that turning.

Also nearby

A question to carry outside

What can the sky tell you if you know how to look?