If you need primer at and hide you can kill a low level one with a ptera, trust me it is easy. They drop a lot of hide and a level 15 dropped me 31 prime. If you found this useful and now you have tons of meat and hide, please ^
Tip : Don't put wooden / metal spike walls near your base if you live in an area with a lot of sauropods.
this is why : since they like to wander around, There's a chance that they will get stabbed by the spikes when they wander near your base. And they will get mad at you, kill your tames, and wreck your base.
so please be careful and think twice before setting up spikes near your base.