Common toads have been blamed for mass crocodile deaths in India . According to the Australian Department of the Environment and Heritage ( DEH ) , the cane toad `` expanded through Australia 's northern landscape at 27-50 kilometers a year '' and is now heading south at a rate of 1.3 kilometers a year . Small Indian mongoose one of the world 's ` ` worst invaders '' Red fox responsible for ` ` dozens of mammal species ''
Common toads have been blamed for mass crocodile deaths in India . Small Indian mongoose one of the world 's ` ` worst invaders '' Red fox responsible for ` ` dozens of mammal species ''