A pack of decent level Raptors are almost unstoppable. Do the roar thing that boosts the pack before each fight, and as many times as the cooldown lets you in the midst of a fight. It boosts their speed, damage, and attack speed I believe.
Either your best friend or your worst enemy. I tamed one and it was a pretty fast mount. It is like the Parasaur but faster and smaller and a carnivore. Can leap on small creatures (or other players if you are on multiplayer) while wild ones bite you only four times when they pounce on you. You can order YOUR raptor to bite until the prey is dead.
This is great for taming other small creatures, because of it's pounce ability you can pounce small creatures such as sabertooths, direwolfs and terror birds without getting damage a little...if you pounce an creature then use your crossbow to tranq them