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Description
I got such a good response from my raptor picture, I figured I had to do Rexy

Okay, so in my Alternate Universe Jurassic Park, Rexy is the largest of several Tyrannosaurus specimens engineered on Isla Nublar: her DNA buffers are Gymnogyps, Torgos, Gyps, and even recovered genetic material from Teratornis and Argentavis. All this was based on the hypothesis in the 1990s (when the original Park was under development) that tyrannosaurs were scavengers; therefore the genetic material used in buffering is largely derived from vultures. Coincidentally, though no ratite DNA was used, the feather filaments of Rexy resemble those of a cassowary or rhea quite closely, even on a microscopic level: though on a molecular and genetic level, they are evidently more primitive than those of avialans such as ratites. Those largely covered in filamentous feathers, Rexy does possess vaned feathers on her reduced forelimbs; she appears to use these primitive wings in visual signals to other tyrannosaurs (though these are not fully understood).

Rexy lives in an expansive forested paddock in the northern part of the island, together with several other Tyrannosaurus specimens (with whom she has developed a family-like social bond). It was found shortly after she grew into adolescence that Rexy (and her peers) displayed active predation and intelligent hunting strategies; this was not expected (particularly with the vulture DNA added), thus it is probable that predatory behavior was a very fundamental and highly-developed element of the recovered Tyrannosaurus genome. Apparently a matriarchal leader of the tyrannosaurs, she leads the others in hunts; pack behavior was not anticipated during initial cloning and experimentation (potential difficulties of containment in light of this behavior has not yet been addressed by InGen staff).

Relatively intelligent (preliminary tests appear to indicate her overall intelligence resembles an owl or vulture), Rexy has displayed sophisticated hunting techniques, such as rudimentary signals to pack members using her wings: using these signals, she can coordinate effective (though not terribly complex) attacks on prey targets. Also displaying maternal behavior towards the youngest tyrannosaur specimens, she often defends them from adolescents (who show cannibalistic tendencies): she is known to have terminated and consumed two specimens in such circumstances. With regard to her senses: her eyesight is very keen, binocular , and her sense of smell is literally the most advanced of any animal ever studied.

When not hunting, Rexy has proved to be relatively docile and spends large amounts of time sleeping. Her calls are reminiscent of a growling crocodile or hissing cassowary ; though she only vocalizes when threatened.

Description
I got such a good response from my raptor picture, I figured I had to do Rexy

Okay, so in my Alternate Universe Jurassic Park, Rexy is the largest of several Tyrannosaurus specimens engineered on Isla Nublar: her DNA buffers are Gymnogyps, Torgos, Gyps, and even recovered genetic material from Teratornis and Argentavis. All this was based on the hypothesis in the 1990s (when the original Park was under development) that tyrannosaurs were scavengers; therefore the genetic material used in buffering is largely derived from vultures. Coincidentally, though no ratite DNA was used, the feather filaments of Rexy resemble those of a cassowary or rhea quite closely, even on a microscopic level: though on a molecular and genetic level, they are evidently more primitive than those of avialans such as ratites. Those largely covered in filamentous feathers, Rexy does possess vaned feathers on her reduced forelimbs; she appears to use these primitive wings in visual signals to other tyrannosaurs (though these are not fully understood).

Rexy lives in an expansive forested paddock in the northern part of the island, together with several other Tyrannosaurus specimens (with whom she has developed a family-like social bond). It was found shortly after she grew into adolescence that Rexy (and her peers) displayed active predation and intelligent hunting strategies; this was not expected (particularly with the vulture DNA added), thus it is probable that predatory behavior was a very fundamental and highly-developed element of the recovered Tyrannosaurus genome. Apparently a matriarchal leader of the tyrannosaurs, she leads the others in hunts; pack behavior was not anticipated during initial cloning and experimentation (potential difficulties of containment in light of this behavior has not yet been addressed by InGen staff).

Relatively intelligent (preliminary tests appear to indicate her overall intelligence resembles an owl or vulture), Rexy has displayed sophisticated hunting techniques, such as rudimentary signals to pack members using her wings: using these signals, she can coordinate effective (though not terribly complex) attacks on prey targets. Also displaying maternal behavior towards the youngest tyrannosaur specimens, she often defends them from adolescents (who show cannibalistic tendencies): she is known to have terminated and consumed two specimens in such circumstances. With regard to her senses: her eyesight is very keen, binocular , and her sense of smell is literally the most advanced of any animal ever studied.

When not hunting, Rexy has proved to be relatively docile and spends large amounts of time sleeping. Her calls are reminiscent of a growling crocodile or hissing cassowary ; though she only vocalizes when threatened.