You don't even need a trap for it it is very very slow you go to the high ground and shoot it with tranq arrows or tranqulizer dart it will easily knock down but you have to give him like 200 bio toxin because it will wake up very very fast
If you want to knock it out effortlessly, place a wooden cage and lead it towards the cage. It will start attacking the cage. You can shoot it with tranq arrow and BOOM! You have made it unconscious. Also, it eats berries.