Here is some science relevant to the lead issue... Want more?
Walter, H., Reese, K.P., 2003. Fall diet of chukars (Alextoris chukar)
in Eastern Oregon and discovery of ingested lead pellets.West.
N. Am. Naturalist 63, 402–405.
Wayland, M., Bollinger, T., 1999. Lead exposure and poisoning in
bald eagles and golden eagles in the Canadian prairie
provinces. Environ. Pollut. 104, 341–350.
Wayland, M., Wilson, L.K., Elliott, J.R., Miller, J.E., Bollinger, T.,
McAdie, M., Langelier, K., Keating, J., Froese, J.M.W., 2003.
Mortality, morbidity, and lead poisoning of eagles in western
Canada 1986–1998. J. Raptor Res. 37, 8–18.
Weir, D., Hanson, A., 1989. Food habits of great horned owls (Bubo
virginianus) in the Northern Taiga of the Yukon Territory and
Alaska. Can. Field Nat. 103, 12–17.
Wiemeyer, S.N., Jurek, R.M., Moore, J.F., 1986. Environmental
contaminants in surrogates, foods, and feathers of California
condors (Gymnogyps californianus). Environ. Monit. Assess. 6,
91–111.
Wiemeyer, S.N., Krynitsky, A.J., Wilbur, S.R., 1983. Environmental
contaminants in tissues, foods, and feces of California
condors. In: Wilbur, S.R., Jackson, J.A. (Eds.), Vulture Biology
and Management. University of California Press, Los Angeles,
pp. 4727–4739.
Wiemeyer, S.N., Scott, J.M., Anderson, M.P., Bloom, P.H., Stafford,
C.J., 1988. Environmental contaminants in California condors.
J. Wildlife Manage. 52, 238–247.
Windingstad, R.M., Kerr, S.M., Locke, L.N., Hunt, J.J., 1984. Lead
poisoning of sandhill cranes (Grus canadensis). Prairie Nat. 16,
21–24.
Wobester, G., Wobester, A.G., 1992. Carcass disappearance and
estimation of mortality in a simulated die-off of small birds. J.
Wildlife Dis. 28, 548–554.
Work, T.M., Smith, M.R., 1996. Lead exposure in Laysan albatross
adults and chicks in Hawaii: prevalence, risk factors, and
biochemical effects. Arch. Environ. Contam. Toxicol. 31,
115–119.
