I've no clue as to how wildlife biologists do the measuring, but "they say" that there is certainly less scent from fawns and from cottontail rabbits than from other animals. That's from the guys at Texas Parks & Wildlife, anyhow.
Wiping a fawn's butt with a warm, wet sponge triggers the nursing instinct, if you try to raise one. Baby bottles work well. Mix Carnation canned milk in a 1:3 ratio with water.
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