To SRG and Robert: we humans can, overall, for better or worse, effect habitats more than any other species, yes? And, wherever your neck of the woods is, the native fauna there has evolved with the native flora there, yes? And native habitats have been harmed by human construction, intensive farming, etc., yes? And our garden space, which may be planted with native flora to compensate for such harm, adds up to quite a lot, yes?