Which animal is the most undisputed breed?

Which animal is the most undisputed breed?

There is no competition for rabbits in terms of reproduction. A female can start having children when she is in the fourth month of her life and can carry 9 fetuses in one stomach.
Her pregnancy does not last more than one month and she can get pregnant again after giving birth
Scientists say that the number of one million rabbits that can survive within three years is the number of one million rabbits, provided that ninety percent of the rabbits are preyed upon.