Heh, wow okay let me set the record straight.
There are three raptor tribes in Trespasser in order to have a reason for them becoming tougher as the game goes along. Otherwise they are randomly more powerful later on for no reason, as enemies are in most games. The first tribe is like the classic TLW raptors, the second tribe was a made-up skin for which the developers used their own imagination (as any good game designers should), and the third is a recolor of the original raptors, a bit more tiger-like I suppose; and then of course, RaptorCBoss is a recolor of THAT, being black and red. The exact method of visually differentiating the raptor tribes was not decided on until fairly late in development. All original conceptual images of Trespasser show only the orange&red classic TLW raptor. However, there is this image which shows what was probably their first concept for a second tribe:
http://trescom.3dactionplanet.gamespy.c ... aptors.jpg
This follows your point of the female raptors being brown fairly well, which of course then goes into conflict with the basic idea, because the skin difference is intended to represent tribes and not gender. (In JPDS, there are 2 skins for each tribe, either male/female or normal/alpha, which adds up to be a lot of skins and is probably why the Tres devs did not take that route.) After that, there is the fabled "brown raptor" seen in several images, such as this:
http://trescom.3dactionplanet.gamespy.c ... asser4.jpg
I can see why they didn't stick with that. The raptor tribes all end up being too similar to each other, so a development decision was made to create 3 radically different raptor tribe skins which could be instantly identified by the player from any distance. This is the manner in which you proceed in creating a working game, not in recreating a movie environment, and it's important to realize what they set out to do.
As for the tyrannosaur, many people here (perhaps even a majority) refer to him as the "temple guardian rex", a term I believe was coined sometime in the past 2 years. It's kinda funny since there aren't really temples in Ascent 1, but it has a nice ring to it and a pyramid is close enough. ;P I'm not on my own computer at the moment so I can't bring up the model name, but it is in fact the Alpha rex, just as RaptorCBoss is the alpha raptor. Alpha males are frequently major components of JP games, and make for an easy way to create boss-dinos when you don't want to create a whole new creature. (yay for Deinosuchus!

) Like the second "red" raptor tribe, the skin for the Alpha rex was conjured out of their imagination, and like Nedry, they felt they needed to keep a back door open.
