In the 1920s and 1930s, poisoned baits were strewn across the West in the Biological Survey's attempt to eradicate all predators for the benefit of livestock growers. |
This governmental entity extirpated species like wolves and grizzlies from the lower 48 states. In her 1934 pamphlet, Edge described poisoning lines intended for predators. In one case, 700 miles of poison baits were strewn along on Idaho's Lemki National Forest leaving a wake of dead predators. The Biological Survey's annual reports crowed about these successes. A 1923 annual report declared, 'not less than 75,000 coyotes were killed by the poisoning operations . . . many wolves, bobcats and a few mountain lions were also poisoned' (Edge, 1934). |
| Non-predators suffered too. Edge wrote that farmers complained about prairie dogs, gophers, ground squirrels and field mice. The Bureau, according to Edge, dropped over three million pounds of poisoned grain on over fourteen million acres in the late 1920s (Edge, 1934). Poisons decimated the prairie dog ecosystem across the Great Plains. Songbirds and other non-targeted species ingested the poisoned grain, adding to the death toll and the ecological implications. |
Prairie dog carcasses. In the 1920s, the Biological Survey poisoned tens of thousands of prairie dogs, birds, and other species across the Great Plains in a misguided attempt to help farmers. |
| Slowly the Survey was forced to change. By 1930, scientists began to discover the importance of the role of predators in the ecosystem. Historian Thomas Dunlap suggests that it took a dramatic episode to shake the scientific establishment. In the winter of 1924-1925, a herd of deer on the northern rim of the Grand Canyon that had been "protected" from predators for two decades suddenly died in great numbers. The range, badly overgrazed, left the deer with little to eat. Declares Dunlap, "the range suffered damage which would take decades, if not centuries, to repair." But the event indicated to scientists that predators played an important role in maintaining ecosystem integrity. (Dunlap, 1983). |
"Biological Survey" spelled out in prairie dogs' bodies. |