The Jonah goat

Goats were the first introduced species to be tackled, following on from the success in New Zealand. Ecuador imported the dogs that were trained in NZ to track the goats, and promptly castrated them (just to make sure they wouldn’t breed should they get away somehow). The hunters were trained to ensure that there was only one bullet used per goat, and the bullets issued were biodegradable in any case.
The hunters each had a dog, and they landed on each island, encircling it. They made their way slowly inwards, shooting goats as they found them. This was of course complicated by the terrain of the islands and the vegetation. If any of the dogs got away, they were given 3 days to return to their owner. If they did not, they had been fitted with collars that administered an electric shock sufficient to kill them by satellite command. Once the hunter had all the goats they could get, they brought in the helicopters, and hunted from the air.
Once they had all they could get from the helicopters, they let loose the “jonah goats” These were feral goats that were castrated, pumped full of hormones, and had their horns painted for identification purposes. The hormone levels attracted the other remaining goats to them, and again the helicopters would come in, shoot all but the Jonah Goat. This would continue until no more goats would be around the Jonah Goat, and then the Jonah Goat was shot too. All the goats were left where they fell to fertilise the soil and encourage regrowth of the vegetation the goats had eaten. This has been very successful, with many endemic plants regenerating, and it also allows for re-introduction of the giant tortoises once they hit 4 years old, with no competition for the food.