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Scientists originally implanted temperature-sensitive radio transmitters in three species of tree frogs in Australia to learn more about how temperature-regulating abilities in frogs might vary with the habitats in which they lived. Unexpectedly, after 25 to 193 days, when the investigators recaptured the amphibians to recover the transmitters, many of the devices — up to 75 percent in one species — were no longer in the body. Instead, the implants had somehow migrated to the bladder.
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