Derrick wrote:
An all-female dinosaur theme park to prevent uncontrolled reproduction was based on the theory, proposed on Jurassic Park, that species could not cross gender. However, Ian Malcolm proposed that "life finds a way," and indeed some of the female dinosaurs transformed into males in order to breed. (It turned out the frog DNA that had been used to fill in gaps in the dino-DNA code was from a rare African frog that could switch genders if the species became imbalanced sexually.)
We all start out in the womb as female, then male hormones take over prenatally and about half of the babies are born male. When I went to Hawaii in 1991 I saw a tropical fish called the wrasse. These fish are all born female. They swim around for quite a while until one day, the most aggressive wrasse turn into males.
I have since discovered that this sex change is common in many animals, including shrimp, oysters, sow bugs, parrot fishes, groupers, angelfishes, humbug damselfish, Red Sea anemonefish, coral goby fish, and the paketi (or spotty) of New Zealand.
For sea horses, the female leaves her eggs inside the father, who raises the brood inside of his belly or pouch, and then gives birth to them at the appropriate time, ejecting them from his pouch into the sea.
The diversity of nature is truly a fascinating thing, which made the movie even more thrilling. You never knew what to expect next because the storyline wasn't that far away from what science and nature may one day accomplish.
Tammy formerly UglyDuckling