Letter from the Desk of David Challinor, March 1, 1991 : Scientists; motivation and methods used; rhinoceros' use of horn; improved technology (night vision enhancers); patience and luck as prerequisites for ethologists
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Letter from the Desk of David Challinor, March 1, 1991 : Scientists; motivation and methods used; rhinoceros' use of horn; improved technology (night vision enhancers); patience and luck as prerequisites for ethologists