Morris, Steve; David Humphreys; Dan Reynolds (2006). "Myth, marula, and elephant: an assessment of voluntary ethanol intoxication of the African elephant (Loxodonta africana) following feeding on the fruit of the marula tree (Sclerocarya birrea)". Physiological and Biochemical Zoology. 79 (2): 363–9. doi:10.1086/499983. PMID16555195. S2CID36629801.
Morris, Steve; David Humphreys; Dan Reynolds (2006). "Myth, marula, and elephant: an assessment of voluntary ethanol intoxication of the African elephant (Loxodonta africana) following feeding on the fruit of the marula tree (Sclerocarya birrea)". Physiological and Biochemical Zoology. 79 (2): 363–9. doi:10.1086/499983. PMID16555195. S2CID36629801.
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Morris, Steve; David Humphreys; Dan Reynolds (2006). "Myth, marula, and elephant: an assessment of voluntary ethanol intoxication of the African elephant (Loxodonta africana) following feeding on the fruit of the marula tree (Sclerocarya birrea)". Physiological and Biochemical Zoology. 79 (2): 363–9. doi:10.1086/499983. PMID16555195. S2CID36629801.