Idk why everyone makes this so complicated with all the grappling stuff all you have to do is,

1. Get or use a tapejara that’s a low level with a couple levels into movement speed

2. Get a rifle or crossbow with either darts or tranqs

3. Find a quetzal and then go to the back of your tapejara and set to attack the quetzal

(Since quetzals have high health and ur using a low level tapejara you can actually leave the tapejara to attack the quetzal, it’ll be fine)

4. Knock It out, not over water, and put whatever you want into it and ban you have a quetzal

Btw, you don’t need to worry about the tapejara’s stamina, it doesn’t decrease while you sit in the back seat