Invasive alien species (IAS) are plants, animals or micro-organisms outside of their natural geographic range whose introduction and or spread threatens biodiversity, food security, human health, trade, transport and or economic development. They pose the second biggest threat to biodiversity globally, and in certain ecosystems notably islands, the greatest threat to biodiversity. IAS have reached all corners of the globe and impact biodiversity in many ways. The cost of damage caused by invasive species is estimated as US$ 1.4 trillion per annum – close to 5% of global GDP.