2000. The use of GPS radio-collars to track elephants (Loxodonta africana

(Tanzania) to study migration routes and the use of space by elephants (Loxodonta africana). Five fe-male elephants were captured in November 1997 in five different areas of Tarangire National Park and fitted with GPS collars. The collar consists of a 6 channel Global Positioning System (GPS) receiv-er, a radio-modem for data communication, a non volatile memory, and an independent VHF trans-mitter. The operator can cccommunicaten with the collar through a command unit connected to a PC. The GPS collar receives signals from different satellites which permits automatic calculation of its po-sition, with an accuracy of 25 m. The data collected in the period November 1997-April 1998 show that three female elephants mainly used the northern sector of the park, moving sometimes outside the protected area about 10 to 20 km NE of the park boundary. Also the two female elephants cap-tured in the southern sector of the park moved outside, travelling about 80 km SE of the park bound-ary Home range size varied between 159 and 660 km2 for the northern elephants (n = 3), and between 2104 and 3314 km2 for the southern elephants (n = 2). The elephants whose ranges extended outside the park exhibited their highest movement rate from 4 p.m. to 12 p.m., while those animals within the park had the highest movement rates during daylight hours (from 8 a.m. to 4 p.m.). We discuss the advantages and shortcomings of GPS-telemetry as a means of gathering useful information on space use and movements of elephants for the development of long-term conservation strategies for large herbivores in the whole Tarangire area