User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6050823-20131012205315

Things you may not know about the Tigrex Rare Species(Info from wikiwiki.jp and from MH4 in-game itself while I was playing)

Firstly, as I said below there is some type of explosive powder/explosive substance on its body, most likely giving it that red color.

The Tigrex Rare Species has huge scars on its body that surpasses the amount found on the normal Tigrex Species, suggesting that it has a harder and tougher life(The scars are covered by the powder/substance).

The Tigrex Rare Species was recently discovered and was never witnessed, known, or anything like that. There isn't even any legends or tales about it.

From it being recently discovered and literally nothing being known about it. They sent afew people to investigate it. From what I've heard only one of them came back(This is coming from in-game while I was playing today by the way).

Its second Rage Mode is improved blood ciruclation keeping it at its peace of mind while also having no sense to its rage but the only problem with this is that it makes hide softer and weaker to attacks.