Toruk Evolution

[Alyara]

Ikran->Velociraptor
Toruk->T-rex

I can see where thats get a lil tricky if they mated, but Im assuming that maybe they dont mate after all due to my current thinking. The way the film portrayed it, besides the inital one that Jake rode (OOHA!), the Na'vi made it seem (at least in my eyes) that a Toruk is not a common species to come across, but that they are lurking out there.

To me that makes it look like that the Toruk population isnt very high (at least nowhere near half of the Ikran population). Since Ikran seems to be its main food supply and there is a vast amount flying high above the Pandorean landscape, there's not alot of Toruk chowing down on these less evolved critters. The basic anatomy is very similar tho, but since the Na'vi dont seem to make mention of a hybrid, I believe there most likely hasn't been one. Cuz that seems like the kind of thing that you would notice.

I do agree with everyone else that the two most likely have a common ancestor, due to the anatomy. This just makes me wonder what the Toruk evolved from and what kind of conditions caused it to evolve to a point where it could feast on a family member. Food supplies must have dwindled off at one point, that's the only reason at the moment that I can come up with for becoming a sub species of the same family and then eating your brother.

Anyways, feel free to add or correct my observation. ^^