certified by the American Zoo and Aquarium Association, the Conservancy is not open to the public and its location is kept secret.]]> species and dozens of others to the brink of extinction.]]> fend for themselves.]]> confiscated ploughshare tortoises were engraved at the Singapore Zoo in December.]]> weary eyes and gleaming shell didn't seem to mind and stared calmly into the distance.]]> poaching and discourage wealthy collectors.]]> conservationists to do the unthinkable.]]> sanctuaries and zoos are using visible identification marks as a tool to fight poaching and discourage wealthy collectors.]]> authorities to trace them if stolen.]]> fertile," Gibbons said.]]> extracts from the species could cure cancer.]]> blemished her natural beauty, so she's just a number in a system now," Gibbons said.]]> engraved at the Singapore Zoo in December.]]> Tortoises are turtles that live on land, and don't usually swim.]]> inscriptions, tattoos and engravings.]]>