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Toxic toads 'threaten disaster'
The toxic cane toad in Australia is evolving into an "eco-nightmare" capable of covering huge distances, a study in the journal Nature reports.
Scientists say the species Bufo marinus is developing a leggier, faster-moving form that is now hopping out rapidly across the continent.
The toads were introduced 70 years ago to control pests, but have since wrought havoc on indigenous animals.
They kill snakes, lizards, water birds - even crocodiles and dingos.
When harassed they secrete poison carried in two sacs behind the head which is lethal to a potential predator within minutes of being ingested.
The mussels not only reduced the amount of algae in the Great Lakes but they also removed pollutants from the water. Each adult mussel draws in as much water as 1.5L per day, retaining the pollutants and expelling the water. So much water is filtered that Lake Erie is now 60% cleaner then it was before the arrival of the Mussel.