PBS: At the crack of dawn on an early winter morning, Double Gs restaurant in Paducah, Texas, would typically be bustling with hunters loading up on sausage, eggs and black coffee before they head out into the grasslands with their shotguns and pointing dogs. Some come to hunt deer, turkey and wild hogs. But most of them come to hunt the northern bobwhite quail. Smaller than a game hen, the dappled reddish-brown bird is as integral to the Lone Star States culture and economy as rodeos and oil rigs....