Most animals (including humans) have an internal body clock that follows circadian rhythms of day and night. However, scientists have found that the speckled sea louse has an extra clock.
The louse has an extra internal clock for ocean tides. How did they find this? When they were removed from the sea and placed in a lab, they swam every 12.4 hours as if the tides were changing.
Scientists are excited because it's an entirely unexplored field of biological clocks. Check out the source for more info!
Read more at http://www.omg-facts.com/#GOIZdqcy4iwYRLFK.99
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