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Magpie reduction in an urban roost

Author: Joseph L Guarino; Edward W Schafer; Denver Wildlife Research Center.; United States. Bureau of Sport Fisheries and Wildlife.
Publisher: Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife, [1967]
Series: Special scientific report--wildlife, no. 104.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
From 80 to 85 percent of about 250 black-billed magpies (Pica pica hudsonia) in an urban roost were killed with poultry pellets treated with 2 percent 4-aminopyridine, a chemical frightening agent. Before death, birds exhibited typical distress reactions, but other magpies were attracted rather than repelled, as expected, by this behavior. Bait was exposed in metal troughs for 1.5 hours on 4 successive evenings.  Read more...
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Additional Physical Format: Online version:
Guarino, Joseph L.
Magpie reduction in an urban roost.
Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife, [1967]
(OCoLC)957140268
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Joseph L Guarino; Edward W Schafer; Denver Wildlife Research Center.; United States. Bureau of Sport Fisheries and Wildlife.
OCLC Number: 16517314
Notes: "June 1967."
Description: ii, 5 pages ; 26 cm.
Series Title: Special scientific report--wildlife, no. 104.
Other Titles: Technical Report & Image Library (TRAIL)
Responsibility: by Joseph L. Guarino and Edward W. Schafer (Denver Wildlife Research Center, Division of Wildlife Research).

Abstract:

From 80 to 85 percent of about 250 black-billed magpies (Pica pica hudsonia) in an urban roost were killed with poultry pellets treated with 2 percent 4-aminopyridine, a chemical frightening agent. Before death, birds exhibited typical distress reactions, but other magpies were attracted rather than repelled, as expected, by this behavior. Bait was exposed in metal troughs for 1.5 hours on 4 successive evenings. Four months later a second population of about 280 birds using the same roost was reduced 75 percent with pellets treated with 1 percent DRC-1339 (3-chloro-p-toluidine hydrochloride), a lethal agent. One year later the populatino contained only 85 birds. Both chemicals were effective in reducing magpie numbers, but from the standpoint of hazards to mammals and number of treatments needed, DRC-1339 appears more suitable.

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