Native Plants

You always hear the benefits of planting native flowers and grasses in your yard. I want to know why? Some benefits are obvious such as the native insects will be more attracted to them, but what else? I asked this question on www.expertcentral.com I posed the question to an expert in botany and landscaping. I am hoping to get a whole list of facts concerning the topic. I will post the answer- but you can go to expert central and find the plant/landscaping tag to see the answer. Thanks, Steve