So you want a parasaur right? Well parasaurs are herbivores meaning they eat plants. For low level parasaurs you can chase them around with a slingshot to KO. It will take a while to KO one with this tactic but it works. Tranq arrows with bow or crossbow is best to KO a parasaur. After knocking your parasaur out you will want to put herbs in its inventory. If you want to use berries i suggest using mejoberries. Parasaurs have a unique ability to be an alarm for when enemy's are near. You can set your parasaurs to sentry mode to do this. Parasaurs are a good tame for early and late game. They do decent damage and have decent health. You can also ride them with a saddle. Like so noons can see :)