Associated Press - August 7, 2009 7:15 PM ET

JACKSON, Wyo. (AP) - Federal land managers are asking elk and bison hunters in the northwestern part of the state to volunteer to use non-lead bullets.

Managers at Grand Teton National Park and the National Elk Refuge say lead is an environmental toxin that can poison birds and other animals that eat carcasses shot with lead bullets.

Spokesmen for the Wyoming Game and Fish Department and the Rocky Mountain Elk Foundation say they're monitoring the lead bullet issue and don't oppose the federal agencies asking hunters to use non-lead ammunition.

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