How do you prove anything to a court about who owns a copyright? You present what evidence you have and marshal what arguments you can, and hope that the person

How do you prove anything to a court about who owns a copyright? You present what evidence you have and marshal what arguments you can, and hope that the person in the right prevails. As your own links indicate, animals have no more copyrights any more than a computer program would because they are not human, and copyright is explicitly granted to human creative efforts.