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Dolphins sleep with one eye...
open
Dolphins sleep with only half of their...
brain
While one part of dolphin's brains is sleeping, another is...
awake
Dolphins sleep 4 hours with each part of their...
body
Dolphins sleep with one eye open to stop themselves from...
drowning
Dolphins sleep with one eye open to protect themselves from...
danger
Dolphins, as well as people, speak to each other using...
names
When mommy dolphin gives birth to a baby she hears the sound that becomes baby dolphin's...
name
Dolphins have excellent ears and sight, but they can't...
smell
