Some ducks sleep with one eye open

Photo Courtesy: Mahfuzur Rahman Pranto

The ducks at the ends of the line were actually controlling which side of the brain stayed awake, and which dozed. They were engaging in what scientists call single-hemisphere sleep. The eye controlled by the sleeping side of the brain closed, while the active side kept its eye open and on the lookout.


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Tigers are the only cat species that are completely striped even on their skin and no tiger as the same pattern of strips
All the ants on Earth weigh more than all the humans
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A snail can sleep for three years
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