 It's a cloudless spring morning, and high atop a wooden pole in a huge nest, an osprey calls over and over. Ornithologist Eric Green stands nearby, binoculars in hand. The Clark Fork River rushes a few dozen feet away. When she calls like that, that call means she usually sees her mate. He lifts his binoculars and peers downriver. Oh, here he comes. Here he comes. Here he comes.