Pitta recollections
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Geology topics
Publications and source records attributed to G. B. Rathbun.
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To study burrow use by small mammals, we needed to develop a simple, non-invasive radiotag for the endangered giant kangaroo rat (Dipodomys ingens). We designed and tested a radiocollar made of beaded-chain on 4 captive Heermann's kangaroo rats (D. heermanii). Attachment of the collar required no anesthesia, the collar was easily fitted in 1-2 minutes, and it caused minimal stress to the animals. Once the collar design and attachment technique were perfected on the surrogate animals, we fitted radiocollars on 48 giant kangaroo rats for about 15 days. Upon recapture, 12 animals showed some minor fur or skin abrasion on the neck. Overall, the attachment performed as expected and proved to be a reliable method to radiotrack kangaroo rats during our short-term field study.
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In August 1991 we surveyed dugongs Dugong dugon in the coastal waters of Palau using methods similar to aerial surveys conducted in 1977, 1978 and 1983. Twenty-six dugongs (including four calves) were seen, a count within the range obtained previously. The rate at which dugongs were seen per unit flight-time was lower than for any of the other surveys, despite the observers being more experienced than those used in the past. More than 20 knowledgeable Palauan residents (including five dugong hunters) were interviewed about dugong abundance, mortality and natural history. They told us that the illegal killing of dugongs occurs openly. We found locally crafted jewellery made from dugong ribs for sale illegally at four stores. Unless poaching is stopped, we believe that dugongs will become extinct in Palau as they have in several other archipelagoes.
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