In order to save the herd, federal wildlife managers say they may begin fencing in healthy Key deer battling an outbreak of New World screwworm in Florida. Crews have begun building a an enclosure covering several acres in the National Key Deer Refuge at the north end of Big Pine Key, U.S. Fish and Wildlife officials said. If the population of the herd drops below what it needs to survive, vets will corral healthy deer inside the pen. FWS officials are now working with Texas A & M University, where much of the  Key deer research is based, to determine what that number should be. Read more at the The Miami Herald…