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- W2401445546 abstract "Food location times have been recorded in three captive monitor lizards ( Varanus spp.). The results, in the form of regression equations, showed that in general the time taken to locate the food decreased with the number of times the food was offered. ITTLE work has been carried out on learning in varanid lizards (Phillips, 1994; Horn, 1999) which is perhaps surprising given their general impression of alertness even to the casual observer. We devised a simple experiment using food as a positive reinforcer to evaluate association learning in three adult monitor lizards from three species, Varanus niloticus ornatus, V. albigularis and V. exanthematicus. We used monitor lizards for two reasons. Firstly there was always a good response to food as a stimulus in our research animals. The second reason was that many types of monitor lizards are intense active foraging predators (Regal, 1978) travelling large distances in their search for food (Thompson & Withers, 1997; Thompson, 1999 and Bennett, 1998 for a review). We predicted that this behaviour, combined with the interest in food, increased the probability of the experiments giving meaningful results. The work was part of a second year HND research project on animal behaviour at Huddersfield Technical College carried out by IF, MT and MR under the supervision of RM. METHODS AND MATERIALS A variety of assumptions must be made when selecting methods of evaluating learning in animals. The method employed here was based on showing the lizards a food item then repeatedly placing it in the same location in an enclosure where it could not be visually observed. The time taken to locate and consume the food item was then recorded. We assumed that if the lizards were learning from experience then the time taken to locate the food should decrease with the increase in the number of trials. The trials were run from midday onwards which allowed approximately four hours for the animals to heat up and activity body temperatures to be attained. Skin surface temperatures of the lizards were measured with a non-invasive Omega OS204 Digital Thermometer immediately before the commencement and at the conclusion of each trial - i.e. just after the animal had swallowed the food. All enclosures had heating facilities to allow the lizards to bask if required but this was not observed during the trials. The experimental arenas were different for each lizard, all of which were imported into the UK as juvenile animals." @default.
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- W2401445546 date "2003-01-01" @default.
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- W2401445546 title "Response of monitor lizards (Varanus spp.) to a repeated food source; evidence for association learning?" @default.
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