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[APD] Cardinals, finned or feathered

Richard wrote:

>> I thought maybe they evolved schooling behaviour as predator defence
because they are so vivid :) ?

I doubt it.  Schooling behavior among Characins is more common than not.
And many more Characins are NOT so brightly colored.  Think about birds...
Do they flock because they are brightly colored?  Or do they flock for other
reasons, and SOME birds happen to be brightly colored. ;-)


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