User blog comment:Kogath/Monster Hunter X Discussion/@comment-5020152-20150808212626/@comment-184612-20150821223536

"Zamtrios have been discovered to eat plesioth outside of the Frozen Seaway in much warmer and tropical waters"

No where in that text did it say Plesioth was in Snowy Mountains. It was saying they go to warmer waters to hunt Plesioth, as well as other areas (Snowy Mountains) to find other food.