1. Search area near dam and make sure beavers aren’t too close
2. Equip bolas, open dam, and quickly grab everything that isn’t wood then get out of the menu.
3. Swing bola until you see the beaver(s) charging at you, let it get close enough that you can’t miss and then bola it.
4. Tranq with headshots, preferably with darts. Even better if you have an Argent, pick it up and fly it to your base to tame - they will likely lose aggro mid flight so when you land at base it’ll just start wandering around again. Unless you have the kibble use Mejoberries - crops don’t actually work much better and are far more accessible.