This descriptive study aims to determine the perceptions of the prospective science teachers about biological diversity with a field trip organized to Abant Natural Park in Bolu/Turkey. Turkey is one of the most important countries having the richest biological diversity in Europe and Middle East. Sample of the study consists of 20 prospective science teachers. A field trip is organized for the research with five activities. The data were collected via five open ended questions and analyzed by qualitative method. According to the results of the study prospective science teachers should be educated about biodiversity. (C) 2013 The Authors. Published by Elsevier Ltd.