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it's camouflage
that Nature uses to protect each species ... over time it adapts
the most dramatic examples are the octopus, the chameleon,
and flounder that can blend right in....to their surroundings...
Fish use starlight to get their bearings...too ...all animals do
and from being around horses for many years
i know that they absolutely freak out if put in complete blackness...
and they need a light bulb on or have to see the stars.
when the sky is over cast with clouds AT NIGHT
a dark plug whether its Dark GREEN , blurple, or Black
can been seen on the surface or just below the surface
against the grey background of the clouds from below
....or starlight too
with bait fish knowing they can leap to safety into the air and
sometimes escape....
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