Correct at last!
I thought you guys are never gonna get it.
The Indian Myna is known in India as a farmers friend because it eats lots of insects.
However when imported into other countries like Australia and South Africa to do the same they quickly became a pest because they had no natural enemy in those countries.
OK compman now it's your turn to think of an animal.
Go for it.
Here's a picture of the Indian Myna.
http://img406.imageshack.us/my.php?image=imynah5ye.jpg