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.

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.

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

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

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)

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

I know that you are already dead before you read this

Just use a skiff and problems solved.

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

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

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

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

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!

They're cute

These guys are now on mobile and have a special ‘unbury’ whistle

Around 5 tranq arrows, stacks of meat/prime meat, and you got yourself a terrorist.

This fat ass badger can’t even be carried by argys and argys can carry parasaurs and baryonxs