Pros: you can bury them underground and put them on passive for a hidden storage box. You could bury them and put them on neutral or aggressive and when you get raided your enemies won't even have a clue what hit them.
They knock enemies off mounts and stun them.
They do crazy damage.

Cons: sometimes I even have a hard time remembering and finding where I buried them.

How to tame: find one that's already attacking something, when it wins the fight lure it into a dino trap and tame it. (If its badly injured give it time to regain health before taming).
Otherwise If you try looking for one under the ground it will stun you and most likely kill you.

Find these guys in the redwoods, they’re everywhere, but be careful, while your taming make sure you have something super strong and on aggressive next to you. Cuz the redwoods are the last place you want to go to if you don’t have armor and metal shield(s)

Craft ghillie armor and four dinogates with gates. Find a mine shaped pile of mud in snow area. Kill everything dangerous in the area. Crouch and place dino gates around the mound. The purlovia cant escape the pen now. Ghillie armor very important so you can place gates without it seeing you.

Standard ko tame. Don't use arrows for higher lvl ones unless u have to or else there is a good chance it will die. USE A TAMING PEN!!

Take Care when searching with flying Mounts for Ovis. They can throw you Off and Paralyse your bird for several seconds. In combination with Packs of wolves this can be your and the birds Ende. I am speaking of experience.
When they are Buried you May See a small mountain.

If your a low level and you know that you will be raided from others in the same position tame one of these dirt kittens to use as a "important item chest" if you are afraid it will be found don't be you are the only one that can see the dirt mound and they use less food while underground

After You Tame These You Can Hide Important Loot!! So All You Do Is Put It On Passive Then Put The Loot In And Bury Only You Can See The Dirt Mound Works Great For PvP

If flying low to the ground it will knock you of your bird and stun you both.

Really just 2 to 3 tranq arrows to knock out and just 10 stacks of meat or more

I know that you are already dead before you read this

So I was on ex getting one I lire it out then I get my crystal wyvern to a surprise capability chart is a lie you can't pick these with a crystal wyvern.

You can store valuable items in them and tell them to dig underground when getting raided

In the north looking for a pure white wolf for an hour - finally found one went down on my argent to pick it up then bang I'm off my bird and the wolves are eating me and my best bird :( f***ing badger

You can use a snow owl to not run into these guys just turn of the weird Vision and you can see where they are!

Watch out for these guys, they can jump at you and freeze you just like the cnidaria and they have a huge knockback

He attacked me why I was offline using god console in I tamed him in now he’s in his hole:)

Use a low level tamed troodon to locate it safely then built a cage around it with ghilli suit on

Kill it get its implant revive it at one of the revival platforms and tame it (it might be easier to build a trap around the revival platform)

Make sure you stay near them!! I nearly lost a lvl 150 to a terror bird because I was getting extra meat

Use a Quetzal to pick it up. Make sure you have two people on 2 different birds for a better chance at grabbing it. Its also good in case the first Quetz loses its rider and is being attacked. Drop into a room that it can't damage and tame away. You could also have someone carried by a Pteranodon but it isn't safe because it could hit the person being carried which will then fall to his/her death. Happy taming!