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While Jurassic World mentions multiple times that the DNA composition of the I-Rex is classified, the only words out of Dr. Wu's mouth are cuttlefish DNA and tree frog DNA. During the scene of his secret lab in the back of the main area in the Hammond Creation Lab, we see multiple animals in tanks. Have anyone identified what they were?
What we know so far: Base: Tyrannosaurus Rex Dinosaurs: -Abelisaurs (ultra-tough bony osteoderms) -Carnotaurus (horns above the eye orbit) -Majungasaurus -Rugops -Gigantosaurus -Velociraptors
Animals: -Cuttlefish (Used to allow the I-Rex to survive accelerated growth. Chromotophores used for camouflage a side-effect. Said in Dr. Wu's explanation to Masrani) -Tree Frog (Allows it to survive in the tropical climate. Some species of tree frogs can control how much water evaporates through their skin, allowing them to control their body temperature, possibly what allowed the I-Rex to trick the thermal sensors.)
There were white snakes and some lizard that grabbed food with its opposable thumbs. Anyone capable of identifying them? I'm guessing the thermal sensing comes from the snakes and the hands comes from that lizard.
(Dino info from http://www.jurassicworld.com/dinosaurs/indominus-rex/ )