User blog comment:PitchBlack696/Brute Tigrex/@comment-3029529-20100902144625/@comment-1011548-20100903191209

Hm, there are very, very minor aesthetic changes, as DarkAngel Reid said, but they're no where near as obvious as some Unite subspecies - Emerald Congalala had a bigger hair tuft, and was bald over its back legs, thought admittedly the crabs just got different skulls and Copper Blango just had a slightly different face.

Those spikes at the back of his head, behind the eyes, or "horns" are there on normal Tigrex.

Eye glow is pretty cool, though, and I'm loving the look of what I assume to the Agnaktor Gunlance.