蜗牛资料:
http://baike.baidu.com/view/16145.html
蜗牛图片:
http://blog.cfan.com.cn/batch.download.php?aid=92918
http://www.rayli.com.cn/2006-04-17/L0011008_159934_3.html
http://www.skysucai.com/sucai/dongwu/jiaqing/tu/200603/81578.html
http://www.netsailing.net/html/2007-03/185.htm