The giant African land snail was introduced onto an island in the South Pacific, primarily as a food source. But it was soon found to eat vast quantities of the natural vegetation and even some of the crops. To solve the problem, the much smaller predatory snail Euglandina was introduced, ＿＿（1）＿＿ that it would keep the numbers down by eating the eggs of the giant snail. ＿＿（2）＿＿ , Euglandina chose to prey on the even smaller native Partula snail, an innocent party in the affair. The Partula snails were completely ＿＿（3）＿＿ on some islands. The situation is now ＿＿（4）＿＿ an international breeding program. And the Partula snail is being reintroduced to its previous habitats. A lack of ecological understanding contributed to the ＿＿（5）＿＿ of Partula, which is now to be saved by ecology.