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Parks director-general Mr Vitalis Chadenga said several conservancies had deteriorated due to the illegal settlers' activities.
"A number of conservancies are no longer existing in their original form.
"Government directives to spare these conservancies have partially been implemented but there has been rampant poaching," he said.
Mr Chadenga said between January 2010 and March this year, 16 poachers had been killed in stand-offs with authorities, while 2 572 people had been arrested.
He said 52 rhinos had been killed on both Parks Authority and private conservancies.
Mr Chadenga said there appeared to be insufficient political will to remove the illegal settlers.
Mr Chadenga admits the problem, and is brave to speak out against the brass...