In this well-explained article in MINT, Padmaparna Ghosh writes about protected areas are fighting battles with invasive species (like The  African Black Fish (African Magur) or  Prosopis juliflora, locally known as vilayati/foriegn babul/keekar), all of which were introduced to India either by design or accident.

Click here to view a slideshow on how alien species are threatening local eco systems.