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Reduction of a Raven Population on Lambing Grounds with DRC-1339

Kenneth H. Larsen and John H. Dietrich
The Journal of Wildlife Management
Vol. 34, No. 1 (Jan., 1970), pp. 200-204
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3799509
Stable URL: http://www.jstor.org/stable/3799509
Page Count: 5
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Reduction of a Raven Population on Lambing Grounds with DRC-1339
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Abstract

Laboratory tests showed the common raven (Corvus corax) to be quite susceptible (intravenous $\text{LD}_{50}=5.6\ \text{mg}/\text{kg})$ to the avian toxicant DRC-1339 (3chloro-p-toluidine hydrochloride). A population of about 200 ravens causing high mortality to newborn lambs and blinding of ewes on a ranch in northwestern Oregon was reduced 90 percent, in 1967, by baiting near sheep carcasses with DRC-1339-treated cubed meat. A population of about 300 common crows (C. brachyrhynchos) in the area was reduced in the same proportion. The following year, there were only about 10 ravens and 50 crows in the area, and these were again reduced by baiting. A different treatment, DRC-1339 solution injected into the eyes of sheep carcasses, appeared promising for control of small raven populations. Hazards to golden eagles (Aquila chrysaëtos) from DRC-1339 baiting appeared negligible; laboratory tests showed a high LD50 in this species (one bird survived 100 mg/kg intravenously) and a strong tendency to regurgitate both solutions and boluses.

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