User blog comment:Lord Loss/Discussion of the Week: Brute Wyverns/@comment-4697976-20130115014833/@comment-5853890-20130117182959

@DRACO

Tigrex actually lives in the desert, he only comes to the colder areas to hunt. So his color makes sens for being in the desert. He is just a visitor of the snowy mountains and tundra.

As for red khezu? I'm sure there is a logical explanation to that. Something like lots of blood running threw his body or just more fleshy or something idk.