User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6005381-20130203132053/@comment-4009941-20130203183451

It is said by Capcom that all the Raths are simply color mutations in the genes but they never said a thing about Black Rathian The official name for it realy is "Unknown" as the actual monster name as Black Rathian is merely a nickname.

It appears to be a whole new species as its tail is very much thicker and oddly shaped compared to them also, Another thing is they have been reported to gather in the Desert, Sekumaeya Desert to be exact.

Another thing is its internals,Behavior and attacks dont match it being a true Rath. First of all gas releasing pores,Extremely strong advanced flame sac allowing blue flames and Blue power (Similar to Teostras),A roar strong enough and specialised to creat a field of wind around its body,Wings strong enough to make wind that can throw hunters directly into the air,Feet strong enough to crush the ground beneath with stomps,Able to eject the spikes on its wings and regrow then at fast speed and dont forget these spikes are covered in the same gas from its poors possibly meening its body is full of the stuff.

It is also stated by Capcom description that this creature is ancient species not a new one its been said that it is ancient as the wyvern ancestors and is possible actualy the source of the Raths species since it is possible that its species could be Just as,Older,Or almost as old as White Faitalis which is said to be the first Elder Dragon.

Capcom has not stated if Black Rathian ((True name is "Unknown")) is a rath or not.