And essentially, the story is this with right whales, that about a million years ago, there was one species of right whale on the planet, but as land masses moved around and oceans became isolated, the species sort of separated, and today we have essentially two distinct stocks.
E, essencialmente, o que acontece com as baleias francas é que cerca de um milhão de anos atrás, havia uma espécia de baleia franca no planeta, mas conforme as massas de terra se moveram e os oceanos se isolaram, a espécie se separou e hoje existem, essencialmente, dois tipos distintos.