In the southeastern part of Australia is the world's longest chain-link fence length of 5614 kilometers, interrupted only at the intersection of highways. It was built in 1885 to protect the sheep pastures of hunting them dingo. The whole fence performs its task - the loss of the sheep from dingoes really decreased. At the same time, these territories have increased populations of rabbits and kangaroos competing with sheep for grazing. Another fence in Western Australia, stretches for 3253 kilometers and is not currently supported, have been erected to protect the rabbits, which are one time a strong environmental threat to the continent.