CONDON, Mont. -- Along about Labor Day, a tall, dark stranger known as "M-23" is likely to take a 40-mile trek south to Seeley Lake. There, peering out from a wooded, marshy area, he'll see tourists sunning themselves outside lakefront cabins and motorboats buzzing through the placid waters of this popular resort. Chances are, nobody will see M-23, which may be just as well. Weighing 325 pounds and standing more than 6 feet tall, with a distinctive shoulder hump, he sports long scimitar-like claws and has a face scarred from years of vicious fights with other male grizzly bears. Though...