Olfactory, thermal, and tactual influenc
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Gaylon L. Oswalt; Gilbert W. Meier
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Article
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1975
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John Wiley and Sons
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English
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## Abstract The amount of time infant rats 3โ13 days old spent emitting ultrasounds was greater when pups were placed in an empty dish than when placed in a dish containing clean bedding or soiled bedding from the nest. Pups from 5โ13 days of age vocalized more when on the clean bedding than when o