direction. But if the sky was overcast at the time of release, the shearwaters flew around in circles.

Monarch butterflies use the Sun as a compass to guide their southwesterly autumn migration from Canada to Mexico.

Orientation by the night sky

In a pioneering experiment, Lockley showed that warblers placed in a planetarium showing the night sky oriented themselves towards the south; when the planetarium sky was then very slowly rotated, the

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