Since completion of the fence on the Etosha's northern border the whole game park is now fenced in, causing management problems and more intensive research, also because the game park is an ecological unit no longer. Elephants breaking through the fence, doing damage on neighbouring farms and lions going through the breaks, still pose a problem in spite of the fact that a large part of the fence was re-enforced by adding three wires and that nature conservators spent more time keeping elephants away from the farms. Seven culprits had to be shot. Owing to the success of an experimental elephant fence in the north-eastern corner of the park the Executive Committee approved that 20 km of elephant fence be erected per annum at places where the animals break through .