Very easy to find a high level one on "the island map". Go to the island in the upper right corner of the map, its known as carno island, but I call it carnivor island cause theres more than carnos there. You can find Raptors, alpha raptors, scorpions, carnos, arges, sabers, and rexes. I suggest looking towards the shore, it isn't as dangerous, and its easier to spot enemies if you already knocked something out. There is an abundance of carnos so finding a good level one is good. And be careful when knocking one out that it doesnt get knocked out in water, they will drown, I lost a level 120 and 150 like that, dont be me! Large bear traps will work on carnos, but depending on how high the level, the more you will need, I suggest 2-3. Knockout with either darts or the tranq arrows. And prime meat is easiest, just let it starve out long enough, you can use kibble but I prefer prime meat.
A simple way to get these guys is to simply distract them with something delicious. Command something tanky (Ex. Carbonemys) to attack them, then set them to passive so they don’t kill the Carno. Then, you can pelt it with a slingshot or bow and tranq arrow until it goes down. They don’t have the biggest torpor stat, so raising it to max won’t take many tranq arrows (5 if it is extremely low level)