Ancient Jungle with dinosaurs

An ancient jungle with big trees and fern. Dinosaurs would spawn there, some more common and some more rare. The herbivores could be held as cattle, the carnivores could be hostile under certain conditions (like if you hit them or if you are not sneaking). There could also be hostile giant mosquitos and mountains filled with lava. If you would find dinosaur eggs you could raise dinosaurs in captivity. Some dinosaurs could be ridden with a saddle (like triceratops and pteranodon).