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OTTERS ARE LONG IN TIME AND SPACE
Otters have existed on earth for 30 million years. 30 000 000 years, or 30 000 millenia.
That's 150 times longer than humans are known to have existed.
If you count the early otterish mammals, then that's 150 million (150 000 000) years of otters, or 750 times the human existence.
In other words, if otters had existed for 1000 years, we would have been here for about 1.3 years.
Otters are pretty long.