Board Thread:General Discussion/@comment-26237273-20150617140442/@comment-10906513-20150721005338

Collector1 wrote: I think I know how Dr. Wu kept the dinosaurs from breeding: he used frogs that couldn't change gender. He just modified the genomes of the dinosaurs that were still living on Nublar and just didn't use reed frog DNA. In Jurassic World they didn't use frog DNA, they used ostrich and crocodile according to the official JW website.