In JPOG, there are three kinds of fences. High security, medium security, and low security. The low is primarily used for the herbivores. The medium fences are used for slightly larger dinosaurs such as the Velociraptor, and Triceratops. Lastly, the high security fences are used for large carnivores. Fences are very important for maintaining security in the park, so your visitors do not feel unsafe. They also are needed to captivate dinosaurs, for preventing chaos. It is very important to have the right cages for your dinosaurs. If they are too small, a dinosaur could easily break out. Make sure you have the right size, you can always check in the dinopedia.