Sure, you could chop up a bush and bash a plank, but it would be even more awesome if the bush could heal itself over time, new plants could grow from the ground and perhaps even change over periods of time. If you've destroyed something (like that poor plank) it would be nice if somebody could fix or replace it after a while. And so on... Other suggestions regarding this?
instead of hand placing fauna make it spread itself. for example, mushrooms release (invisible) spores that grow new mushrooms. so if you remove all the trees from one area, then it regrows slowly with grass, shrubs, small trees, and eventually forests. let fauna grow itself instead of hand placing or randomly generated, actual reproduction of nearby species.
so when you first start the game, none of the fauna was hand placed, it was all grown over centuries of (in-game) time and is still growing and changing the landscape.
this idea is prolly way to far fetched as far as development and CPU usage goes.
edit: changed an badly place adverb to an adjective.