"This goes back to ..."

[Odessa Dawn]

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Do Elephants Sleep Together

Elephants don't sleep together and in fact, they don't even sleep at the same time. This goes back to their watchfulness for predators.
More: How Do Elephants Sleep? | eHow.com

Does goes back in the given context mean to think about something from the pasts, initiate, or because?
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[5jj]

The reason originates in ...