International Journal of Biodiversity and Conservation 2141-243X Academic Journals 10.5897/IJBC2013.0554 Hailemariam Areaya Tsegazeabe Hadush Haileselasie * E-mail: hilinatsegazeabe@yahoo.co.uk 2013 31 08 2013 12 06 2013 5 8 461 468 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/IJBC/article-abstract/58E2D4111435 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/IJBC/article-full-text-pdf/58E2D4111435