Measuring body temperature in the field-evaluation of external vs. implanted transmitters in a small mammal

Measuring the body temperature of animals living under natural conditions has gained increasing interest. This study shows in the small lemur Cheirogaleus medius that for many questions external collar transmitters can constitute an excellent alternative to implanted transmitters. During both active as well as inactive phases, data from collar transmitters precisely reflect core body temperature over a wide range of ambient temperatures. Even minor changes in the body temperature are detected, and collar transmitters are very adequate for determining general patterns of body temperature and activity in suitable species.