From Egyptian geese at lakes to Asian hornets in trees and bullfrogs in ponds, invasive species present a growing challenge to farmers, beekeepers and conservationists around the world. “Invasive species are only a small proportion of neozoa, but they can cause massive problems,” says Lisa Tippelt, a nature conservation officer in Germany. Animal species have been colonizing areas through human intervention – dubbed neozoa – since the beginning of intercontinental trade at the end of the fifteenth century. The number of new forms of life causing problems is quite small. Tippelt says around 10%…