a proposed 15-foot-tall triple barrier is built between the United States and Mexico, illegal immigrants may have to take a tip from The Odyssey to get across. That's assuming measures are taken to safeguard the crossing of the endangered peninsular ranges bighorn sheep, whose survival could be threatened by the wall. In Washington earlier this month, a legislative rider attached to the 2007 defense appropriations bill by Sen. John Kyl, R-Ariz., calls for spending $2 billion to construct the 370-mile-long wall. The bighorns, which inhabit parts of the San Bernardino National Forest and thrive on Mount San Jacinto, migrate across...