Mona Island is a Natural Reserve under the management of the Department of Natural Environment Resources (DNER). Mona Island iguana (Cyclura cornuta stejnegeri), is an endemic reptile species of this region which is considered endangered. A headstarting program has been implemented since 1999 by the DNER for Mona Island iguana. As part of the evaluation of this conservation strategy, several animals were tracked after release using radiotelemetry, in order to determine movement and dispersal range. Two release sites were used: Corral Wiewandt (CW, highly intervened by humans) and Carabinero (CAR, better preserved). Each iguana was followed for a certain period of time, and observations were not equally spaced. For each observation, UTM coordinates were obtained. The objective of this study is determine whether behavior of releases iguanas differ between the two release sites.National Science Foundation, HRD #0734826 PR-LSAMP Program HDR #0601843 University of Puerto Rico, Central Administration and Río Piedras Campus Puerto Rico Louis Stokes Alliance for Minority Participation