My observations:

- Gridanians practice forest management very much like modern human organizations do
- Invasive species and those that are a threat to life and welfare are fair game, as is killing for population control (Lv 1 Conjurer and Archer quests and many others).
- The Leatherworker's Guild can reliably supply itself and do so legally; they express a desire to respect the forest and make the best use of the hunted animals that the can. (Leatherworker's Guild intro quests)
- Certain traps and probably other inhumane ways of killing are frowned on. (Lv 20 Archer quest)
- Some species are given special protection; the Admantortise is apparently one of those as their nesting area near Camp Tranquil has a special guard of Wood Wailers. (Lv 30 main story quest)
- Taking eggs, especially of protected species, is illegal; it's probably safe to presume based on RL laws that this applies to young animals and their mothers as well. (Lv 30 main story quest)