There is a scene in the book where, IIRC, a program is run periodically that counts the number of dinosaurs in each paddock based on some sort of dino-scanner.

The program was written in such a way that it expected a certain number of dinosaurs in a paddock and returned a successful result when it reached that number. However, once it reached the threshold, it did not count more dinosaurs. Once modified, the program outputted the correct total, thus identifying that the dinosaurs were producing offspring in a single sex environment.