Dolphins have the ability to rest one hemisphere of their brain at a time, allowing them to remain partially conscious and aware of their surroundings
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Bullfrog
Bullfrogs can enter a state of rest where they remain still and quiet for long periods, but it's not considered true sleep as they are still responsive to stimuli.
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Giraffes
Giraffes sleep in short, sporadic bouts totaling about 4 hours a day, often standing up and with their eyes open to watch for predators
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Jellyfish
Jellyfish do not have a brain or central nervous system, so they don't sleep in the same way more complex animals do
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Walrus
Walruses can stay active for days at a time, foraging for food without showing signs of sleep deprivation
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Alpine Swift
These birds are known for their ability to stay in flight for months at a time, seemingly without needing to land for sleep
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Elephant
Elephants sleep for short periods while standing up, usually at night when it's safer, but they can also sleep lying down for deeper rest