The easy way to tame the Parasaur:

1: Craft a bola and baseball bat

2: Toss the bola into the parasaur's legs, and it can't run

3: Struck the parasaur's head with baseball bat

4: If it's unsoncious, feed it with berries to tame

Now, you have a new friend parasaur

More Parasaur Taming & KO Tips