...Wolff and Githens (1939b:234) made 16 venom extractions from a group of cottonmouths in a two-year period...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Of 315 individual extractions the average amount obtained from each individual was 0...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
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