Earth First!, a radical environmentalist group mainly known for putting spikes in trees to halt logging, is turning its attention to fighting cattle grazing on federal lands.

Earth First! insists the century-old practice has ruined millions of acres of natural habitat on the Western range."It's a real scam," says Lynn Jacobs of Tucson, Ariz., Earth First! national coordinator for the cattle-grazing issue.

Approximately 15 percent of the nation's ranchers buy federal grazing rights for their livestock, paying the federal government $1.86 per head per month, a fraction of what it would cost to buy feed for the cattle.

Much of the money is channeled, in turn, to local governments for building roads, fences and water troughs on the range.