They are in a row, but they are not ducks. The birds in the middle can allow both hemispheres to sleep but those on either end let one hemisphere sleep while the other keeps guard.

They are in a row, but they are not ducks. The birds in the middle can allow both hemispheres to sleep but those on either end let one hemisphere sleep while the other keeps guard.
Time taken: 09:21:54
Time of day: morning
Date: 02 February 2020

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