Dolphins sleep with one eye open.
Dolphins sleep at night just below the surface of the water. They frequently rise to the surface for air.
A goldfish has a memory span of 3 seconds.
A squid has 10 tentacles.
A scallop has 35 blue eyes.
The Sea Horse is the slowest fish, drifting at approximately 0.016 km/h.
The small car on the road is probably the size of the heart of a blue whale.
The length of an elephant is the same as the tongue of a blue whale.
The crocodile's tongue is unmovable, as it is attached to the roof of its mouth.
Sharks apparently are the only animals that never get sick. As far as is known, they are immune to every known disease including cancer.
A father sea catfish keeps the eggs of his young in his mouth until they are ready to hatch. He will not eat until his young are born, which may take several weeks.
An electric eel can produce a shock of up to 650 volts.
Goldfish lose their color if they are kept in dim light or are placed in a body of running water, such as a stream.
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