On the island there are two variations of deinonychus

one variation has slit pupils, the other has round pupils. Originally there was just the slit pupiled deinonychus. Then the slightly modified round pupiled deinonychus was introduced to the island to outcompete the slit pupiled variation. But the plan backfired as these two types can still form packs when they need to. But the two variants aren't capable of breeding with the other variation due to the modifications given to the round pupil type. So now both types of deinonychus roam the island. Another interesting thing about the deinonychus is that their original base DNA was used in the creation of the island's utahraptors and dakotaraptors, which explains why they are very inaccurate in look. The deinonychus can be found mainly everywhere on the island except psittacosaurus forest, the wastelands and the tyrannosaurus rex territory. All this makes the islands deinonychus an interesting dinosaur indeed.