By Meena
Dolphins sleep with one eye open to stay alert for predators and to keep breathing, as they need to surface for air.
Image:Canva
Ducks sleep in groups. The ones on the edges keep an eye open for predators, ensuring the safety of the flock.
Image:Canva
Surprisingly, even tiny fruit flies sleep with one eye open. They're always ready to take flight at the first sign of danger.
Image:Canva
Walruses can sleep floating in water, keeping one eye open to watch for threats and to avoid drifting off course.
Image:Canva
Chickens roosting in trees will often sleep with one eye open to stay alert for predators lurking in the night.
Image:Canva
Parrots in the wild sleep with one eye open, a handy adaptation for living in predator-rich environment
Image:Canva
Porpoises, like their dolphin cousins, also sleep with one eye open. This helps them stay aware while resting.
Image:Canva
Crocodiles sleep with one eye open when humans are around. It's their way of keeping an eye on potential threats.
Image:Canva
Seals can sleep in water with one eye open. This helps them spot predators and also prevents them from drifting.
Image:Canva
Many lizards sleep with one eye open to stay alert. It's a survival strategy in their predator-filled habitats.
Image:Canva
Image:Canva