Invasive species threaten global biodiversity

Invasive species: The red deer is among the 27 invasive species threatening the biodiversity of Chile. Invasive species, if allowed to proliferate, can gradually alter entire ecosystems and wipe out native species. — AFP

Exotic species introduced into new areas can quickly become invaders that are harmful to local biodiversity.

Until a few decades ago, there were no beavers in Patagonia. That changed when 20 pairs of the tree-chewing creature were introduced with hopes of creating a fur industry. Today, their numbers have exploded and they pose a serious threat to the South American area's biodiversity.