Big Green has an unlikely new sales pitch to convince Congress to fund ever-expanding land grabs by the National Park Service -- save wildlife migration. A map overlay showing all the U.S. wildlife migration paths would blot out nearly half the nation -- a very clever diagram for empire-building bureaucrats. The obscure but well-heeled Wildlife Conservation Society (2010 assets $764 million) unveiled the idea last week in "Spectacular Migrations in the Western U.S.," a 45-page report on the purportedly urgent need for a widespread network of wildlife migration corridors to avert countless extinctions. The WCS is a consortium of zoos...