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Matters of migration

Updated: May 29, 2008, 11:24 AM ET
By Jon Walker | Special to ESPNOutdoors.com

Tex-Mex wildcats, bird-watching towns and litigation may hamper the Department of Homeland Security's plans for a border fence in south Texas.

The barrier, currently under construction, will constitute more of a solid wall than a fence — "basically an impermeable concrete wall that is over 12 feet tall," in the words of Josť Viramontes, a U.S. Fish and Wildlife Service spokesman.

Along the Rio Grande, the wall will pass through the Lower Rio Grande Valley National Wildlife Refuge, ...

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