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To answer that, you'd have to go back further than scientists can agree on what happened.
From an evolutionist point of view, the first official dolphin was probably grey, as that seems to be the most common trait between all of them, but could have varied in color depending on unknow conditions.
From a creationist point of view, some minor evolution does occur, but many species of dolphin probably already existed, and can't be traced back to just one dolphin with just one color, but the color you see them with now is more than likely the color they had when they were created.
What else can I help you with?
What is a dolphins colors and markings?
a dolphins color is gray
Do Dolphins color change at all?
No, dolphins may not change colours at all.
What color are most dolphins?
GRAY!
What is a dolphins skin color?
it is gray
What is the color of a dolphins mouth?
grey
What color are hourglass dolphins?
any color you want
What color dolphins live in the Amazon?
pink
Do bottle nose dolphins change color?
no
Why do pink dolphins change their color?
they have the woe
Do pink dolphins keep there color or does it fade?
Pink Dolphins, are Amazon Dolphins. The pink you see is actually blood. So, obviously it stays.
How do you get the original color back from the other color?
Just add the original color to it.
What color are bottlenose dolphins?
blue white grey
