Abstract
A temperature-sensitive acoustic transmitter was developed to record and store stomach temperature. :he equipment was used to quantifY meal sizes in captive animals and to monitor stomach temperature changes in captive animals as a result of intake offood, snow, ice and seawater. The equipment has also been used to time food ingestion in free-ranging animals. The transmitter consists of the electronic circuit, a thermal sensor, an electro-acoustic transducer, a battery and the encapsulation. The time between the transmitter pulses is a function ofthe surrounding temperature of the transmitter.