Direbear have little health compared to torpor. Keep a few tamed dodos at your ramp trap. When you've shot the bear enough for it to be bloody, throw in a dodo. It will instantly kill and eat it and start regenerating health. Give it a moment or two and continue darting. Happy hunting!
Faster than a giga, strong as a rex, with some levels can get to 1k carry, can gather and eat both berries and meat,can even gather fiber, if you tame a high level one you have a super gathering and combat mount. Unmatched in utility.
To reduce chance of killing it while trying to knock it out is by shooting with a primitive crossbow without delay until it starts to show blood then switch to a regular bow and then space shots 7 seconds apart - works every time for me no matter the level
A high level can easily take down Alpha Carno's. It's perfect for taming other animals since it can collect both berries and prime meat. It can go through the central cave and is a highly speedy mount with good carry weight. It's also cuddly.
Dire bears have the same base torpor and torpor gain per level as an allosaurus, meaning darts are almost a requirement (unless of course narco traps are utilised). To put this in perspective, Allos have 63% more base health than a dire bear and gain more health per level, and even with a lvl 150 allo there is still a 1.5% chance that they’ll die for a 100% damage Crossbow. In summary, use darts, it makes it a hell of a lot easier.