system
Given the following post, respond as if you're commenting on Reddit:
human
[Jurassic Park] I read a fan theory that the animals in Jurassic Park were actually created by genetically modifying existing birds and reptiles, not by cloning DNA from mosquito butts, why would they lie about that? and how have they kept the secret for 22 years?

why are raptors created by devolving chickens less impressive than ones created by cloning? also people aloud   to touch the animals in the petting zoos, it would would be so easy for a competitor to take some DNA samples and figure out the supposed sauropods is really just elephant iguana  hybrids?
gpt
I haven't heard of this theory, but if you're the Jurassic Park company, advertising dinosaurs is more attractive than advertising Genetically modified birds. Never mind the genetic similarities, the average consumer doesn't appreciate that. So it's likely a marketing desicion. 

As for the deception, it would be very easy. One would only keep a few key scientists in the know, and the rest would simply be working on DNA of unknown origin. Most geneticists wouldn't be able to determine the truth without a lengthy study using very specialized equipment and knowledge. So even if a few people suspect the JP company of lying, no one wants to expends the resources to find out for sure.