User blog comment:Kogath/Monster Hunter X Discussion/@comment-5020152-20150808212626/@comment-5963861-20150821130550

@Lasatar:   Zamtrios have been discovered to eat plesioth outside of the Frozen Seaway in much warmer and tropical waters, so its not really that far-fetched for them to go to the Snowy Mountains (plus what pike just mentioned). Another good reason for Zamtrios to go there is exploring new food sources. They're Popo, Lagombi, Bullfango/Bulldrome, Giaprey/Giadrome, Velociprey, Blango/Blangonga and Aptonoth for them to feed on. Zantrios being found in the cold Snowy Mountains is pretty accurate.