User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-4009941-20150214220758/@comment-6050823-20150214233630

I must admit a lot of this makes a lot of sense.
 * Both Swamps in the Old World are quite close to the Forest and Hills so I could picture Basarios and Congalala appearing there.
 * There is possibly a frozen sea not to far away from the Snowy Mountains so Zamtrios and Lagombi do make sense.
 * Yian Kut-Ku have been seen in the Volcano plus Yian Garuga are known to be or appear in areas where Yian Kut-Ku are at.
 * The Seregios were scattered by the Apex Seregios so makes sense to see it in another unusual area different from its environment.
 * The Guild have known about Zinogre's existence for a long time so the species being in the Forest and Hills makes sense plus adds to the idea that the Guild has known about them for a long time.
 * Elder Dragons are quite a nomadic bunch so Gore Magala and Shagaru Magala pass plus Shagaru Magala killed nearly all the monsters in the Siki Country in the past along with the fact that the Siki Country is in the Old World.
 * Since Kirin have quite a wide spread population, the same could apply to Dalamadur.
 * Seltas Queen could easily just get a Seltas to bring her to other parts of the Old World with those pheromones controlling his mind.
 * Its been confirmed that the Rathalos and Rathian thrive in the same environments, even though its not really shown much in-game.