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Telemetry provides researchers with invaluable data and has contributed to the progress of animal ecology and behavioral studies. However, the impact of biotelemetry devices on animal behavior and welfare has been evaluated in a few species. The telemetry device (GPS or VHF) is attached to a harness made especially for giant anteaters (Myrmecophaga tridactyla) due to its particular anatomy, and this is the best way to access the scheduled spatiotemporal data of the species’ movement. We evaluated the adverse effects of biotelemetry devices on giant anteaters’ behavior and welfare. Behavioral analysis on giant anteaters in captivity (n = 3) was conducted by observing them with and without the GPS-harness. We also include data on GPS-harness dysfunction and animal injuries observed from free-ranging tagged animals (n=74). The GPS-harness influenced the behavior distributions frequency, but no new or atypical act was verified. Free-ranging individuals detached the harness twice, five removed the front part of the harness, and three had skin injuries. This is the first study to document telemetry device effects on giant anteaters. To date, severe adverse effects of harness-attached GPS tracking devices were not reported for this species. Our data supports the continued use of this method for monitoring free-ranging or captive giant anteaters. However, we recommend and stress the importance of continued research that helps improve telemetry and monitoring techniques. [ABSTRACT FROM AUTHOR]