they would dump these guys on the islands to have a variety of meat for the journey home. over the years, the goats ate just about every plant on isabella, and the tortoises began to starve. so desperate to save them, the ecuadorian government brought in karl who knew exactly what had to be done. >> you used sharpshooters and heshts. >> we did. >> shooting tens of thousands of goats a year. >> it was a lot of work. >> in the beginning, it was easy. but if the galapagos taught us anything, it taught us adapting. the goats heard the helicopters and would hide. so they trapped trackers on female goats in heat.