There’s a broken link in the food chain of California’s brown pelicans, adding a sad chapter to one of conservation’s most striking success stories. Emaciated birds are turning up in California’s ponds, reservoirs, backyards and even San Francisco’s Oracle Park during a baseball game — far from their wild ocean home. Wildlife centers are inundated with the gangly, prehistoric-looking seabirds, nursing them back to health with fluids, fish and medications, but the cost is a staggering $1,500 per bird. Injuries can easily double the cost. “They’re feathered skeletons,” said Rebecca Duerr, direct…