User blog comment:WolfQueen/Monster Appreciation Week: Iodrome (4th Gen)/@comment-4702773-20150628150304/@comment-2123858-20150628194710

I think it's a regional thing, maybe Giadrome/prey only resides in the Snowy Mountain region in the Old World...

That being said we should see them in cross, though I wonder if other older small monsters may just be replaced in their home regions (e.g. vespiod, hornetuar, mosswine)