Board Thread:Movie discussion/@comment-194.83.57.1-20150630111757/@comment-5707564-20150818021358

The reason is because breeding and creating the Dinosaurs were VERY expensive, so why would you create a new one when there's one that's been alive for 25 years? Besides, it would be good for money, considering that Rexy is the oldest LIVING Dinosaur in the series, and to show off her raptor scars would make her seem more interesting.