http://reply.papertrans.cn/3/239/23826/23826-31.png
http://reply.papertrans.cn/3/239/23826/23826-32.png
http://reply.papertrans.cn/3/239/23826/23826-33.png
Submitted on: 07 May 2013.
Revised on: 18 May 2013.
Accepted on: 12 June 2013.
Ornithological Applications
http://reply.papertrans.cn/3/239/23826/23826-35.png
http://reply.papertrans.cn/3/239/23826/23826-36.png