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Sleeping ducks?

Sleeping duck?

Pair of mallards resting on the shore of West Park’s boating lake. The female was perhaps asleep, but the male was wide awake and keeping a close watch on me.

By chance, both pictures captured the birds with their nictating membranes (so-called third eyelids) protecting and moisturising their eyes while still leaving them able to see movement and potential threats.

Sleeping ducks?