What should be done with the wattle-necked softshell turtles on the Hawaiian island of Kauai?

The turtles came from China, starting in the 1850s, brought by sugarcane farmers who liked them as soup. Today, they're endangered in China and considered invasive—the term for non-native species that cause undesirable effects—in Kauai. But conservationists don't believe the animals are safe from hunting in their home range, so there's little point in boxing them up and sending them back.

It's a head scratcher: Should we remove the turtles from Kauai to preserve the native ecosystem there—the turtles could potentially eat native fish—and risk the extinction of their species, or should we keep them alive in Hawaii?

Those kinds of knotty questions are becoming more