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from All That Is Interesting

Ten Amazing Facts About Ocean Animals

Dolphins sleep with only half of their brain and with one eye open so they can watch for predators and other threats.

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from HubPages

About Dolphins

Google Image Result for http://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Bottlenose_Dolphin_KSC04pd0178.jpg/250px-Bottlenose_Dolphin_KSC04pd0178.jpg

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100 mind blowing facts you don`t know about our world. PART I / 1 pretty sure the celery thing isn't true though
from AmonGraf

100 mind blowing facts you don`t know about our world

100 mind blowing facts you don`t know about our world. PART I / 1 pretty sure the celery thing isn't true though

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The variety of ways animals sleep is staggering, and researchers are only beginning to make a dent in understanding the inner workings and purpose of sleep among different species.
from MNN - Mother Nature Network

Strange and surprising facts about how animals sleep

The variety of ways animals sleep is staggering, and researchers are only beginning to make a dent in understanding the inner workings and purpose of sleep among different species.

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from The Lovely Planet

10 amazing facts about dolphins

4- Dolphins believe in develping familes and normally one group of dolphins is also lead by a female one. Several members of a group can even help the members of the other group in hunting and travelling.

from The Lovely Planet

10 amazing facts about dolphins

5- Dolphins take breath from the blowhole, which is an evolved nose that has moved upward to the top of their head. Most of the species also have a dorsal fin, located on their backs which acts like a keel when they swim. Thus it gives them the directional control and stability within the water.