As migratory animals, sustainable management of African elephant populations, both within and around protected areas, is a major challenge in the conservation policy of many African countries. We captured seven female elephants, representative members of family groups, in different parts of Tarangire National Park (TNP), Tanzania, and used GPS satellite radio-tracking (November 1997-June 2000) to monitor their space and habitat use and seasonal migrations throughout wet and dry seasons. Patterns of home range overlap revealed the existence of two Large clans that occupied the north-central and southern parts of TNP, respectively. At the end of the dry season, elephants from the southern clan migrated about 100 km southeast of the park boundary, those from the northern clan remained mostly inside the park, or used periodically wet-season core areas in the nearby Game Controlled Areas. No natural mortality occurred during the study, but two elephants were poached outside the park. Human disturbance also affected activity patterns, and elephants were Less active at day outside than inside the park. Home range size varied from 477 to 1078 km(2) for the northern elephants, and from 1630 to 5060 km(2) for the southern elephants. Migration routes were characterised by higher cover (open and closed forest) than core areas. Our results indicate that elephant management must be considered across park boundaries and that migration corridors must be protected against human disturbance and land cultivation. Society problems Linked to elephant conservation can be solved by creating alternative, sustainable, use of natural resources that enhance the livelihood of Local communities. (c) 2005 Deutsche Gesellschaft fur Saugetierkunde. Published by Elsevier GmbH. All rights reserved.