Abstract
We tested the force-fed-radiotransmitter technique on six adult collared lizards Crotaphytus collaris. We located lizards within their nocturnal refuges using a hand-held Yagi antenna and a portable radioreceiver, and we verified their exact position with a borescope 17 times in 18 trials. Retention time of radiotransmitters in digestive tracts was 3–4 days. There was no effect on digestion. This technique is best for studies of medium to large lizards that refuge in tight spaces and consequently may rub off externally placed transmitters.Probamos la técnica de alimentación forzada de radiotransmisores en seis adultos de lagartijas de collar, Crotaphytus collaris. Localizamos a las lagartijas dentro de su refugio nocturno utilizando una antena Yagi y un radioreceptor portátil, y verificamos la posición exacta con un endoscopio 17 veces de 18 intentos. El tiempo de retención de los radiotransmisores en el tracto digestivo fue 3–4 días. No hubo efecto sobre la digestión. Esta técnica es mejor en estudios de radiotelemetría en lagartijas medianas y grandes que se refugian en espacios reducidos, lo que limita el uso de radiotransmisores externos.
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