User blog comment:Elephant777/Long live the Queen, but how does she live? (Rexy)/@comment-17754282-20150418180629

Ok, I'm not entirely sure where you're plucking these "facts" from but the Dinosaurs on Isla Sorna were made the exact same way as they were on Isla Nublar. It's right there, out of the mouths of Malcolm and Hammond in The Lost World:

Malcolm - "You bred them Lysine-defficient. Shouldn't they have kicked after several days without supplemental enzymes?"

Hammond - "Yes, but, by God, they're flourishing! Its one of the thousand questions I want the team to answer"

This is then followed up by Sarah Harding:

Harding - "I've figured out how the animals survive without lysine. If you look at the herbivore species that are thriving, they eat mosty augama beans, soy... anything lysine rich, and the carnivores, well they eat the herbivores, so..."

The lysine contingency was not merely to keep the park safe - it was to prevent the spead of the animals sould they ever make it to the mainland, as explained by Arnold in the first film. Such a precaution would have been taken on Isla Sorna as well.

Where the hell did you get the idea that Rexy survived 21 years on the island on her own? Just looking at the biography concernign Dr Henry Wu we learn that he was part of the team sent to Isla Nublar during November 1994 in order to deconstruct the ruined Jurassic Park and catalogue the surviving animals and discover how they were breeding. In the film canon, the Isla Nublar incident which resulted in Jurassic Park's closure happened June 11th-13th 1993. Wu and the deconstruction team arrived on the island November 1994. Obviously one of their first tasks would have been getting Rexy re-contained even if only for their safety. So at most Rexy would have had to have survived 17 months on her own, not 21 years.

InGen then kept Rexy alive on Isla Nublar until 1998 when InGen was taken over by Masrani Global Corporation who continued to keep her alive, sensing her as a huge potential asset to their new project, Jurassic World which completed construction in 2004 and was opened to the public in 2005.

So, as I said, 17 months in the wild for Rexy, supported by a potential diet of several Brachiosaurus and numerous Triceratops, Parasaurolophus, Gallimimus, Dilophosaurus and whatever else may have lived on the island. Don't forget, Dilophosaurus would probably not have provided too much competition to a Tyrannosaurus. And yes Triceratops was dangerous. But all Rexy had to do was come across a sickly one that had been West Indian Lilac berries and boom! Job done! That is do-able.

By superior stock I meant that in theory, once InGen recovered from its financial woes by opening Jurassic Park: San Diego (as was their intention in The Lost World) they would have been able to set Wu's labs to ironing out the kinks in the genetic material of their Dinosaurs, putting right what the amphibian DNA made wrong and also removing a few undesired traits. This wasn't mentioned much in the films but there were a large part of the book where Wu and Arnold explain about releasing different "Version Numbers" of their Dinosaurs into the Park. They don't know that an animal is completely correct until it starts to grow - the animal hatches, survives in the nursery, grows enough to be placed into the park, it reaches its adult stage and suddenly something isn't right - a glitch in the DNA, a fault in their genome, something that causes the animal to be sickly and weak because an enzyme doesn't turn on correctly. Or the issue is behavioral - something like aggressiveness. Alterations could also be made to make the animals vulnerable to disease.

As the problems with the animals are discovered, Wu and his team go back to the drawing board to figure out how to alter that at a genetic level, correcting what was wrong, or perceived as wrong, and then developing, growing and releasing into the park a new "version" of the animal, much like a software update for a computer program - they discover "bugs" with their dinosaurs and correct those issues with "patches" to the DNA, resulting in the "superior stock" I referred to.

I would imagine that Rexy's vision issues, the Dilophosaurus' neck frill, the Raptors' aggressiveness and the Brachiosaurus' "chewing" would all be things that would be altered over time in order to make the dinosaurs more "real"