They respected the gods of nature, and actively participated in nature conservation. For the plains Indians, their nomadic lifestyle prevented the accumulation of great wealth (stuff), and there were many unwritten laws which taught conservation and ritual respect was shown to the gods of the hunt. Moreover, nothing was wasted. Bones, sinews, guts, stomachs, all were used for various purposes. In return the Indians often protected herds from predation. Efficient and non-invasive symbiosis. I used to work for the Nisqually and as their main food source came from fishing, historically it was customary during salmon run season to return the very first catch back to the river as a sign of respect to the river gods. Practical conservation. p.s. a little known fact is that the US Constitution is partly based on the 5 Nation Iroquoi Confederacy law. The copycat was Washington who was a secretary at that time and recorded various treaties and Indian Laws and later introduced some of these ideas in the articles of the Constitution. The "one man, one vote" was a fundamental Indian voting law. And the elected chief and officials had to forfeit personal wealth, lest the combination of power and wealth would corrupt the individual. Pretty sage governing laws, IMO.