In simple terms you can think of a "paradox" as two birds, specificaly water fowl...er no wait...lets try again:

In simple terms you can think of a "paradox" as something that SEEMS unreal yet with your own eyes you can see that it IS real. In that respect the image of the animal you posted is exactly that. As to the genetics background on these animals I'll let someone more qualified...or who has done a quick google search answer that portion of the question.