WWF public relations officer Melody Maunze told Zimbabwe's state Herald newspaper the black rhino -- an endangered species whose horn is valued in Asia as an aphrodisiac -- was under threat again.

A severe economic crisis, which critics blame on President Robert Mugabe's policies, have left many government departments struggling to offer decent services, and Maunze said Zimbabwe's anti-poaching drive and penalties against poachers were not tough enough.

"We are aware that there has been an ongoing collaboration by various stakeholders, but we are concerned about the increasing levels of poaching in (private) conservancies in particular, and some state parks," she said.

Maunze and Zimbabwean officials were not available for comment on Saturday.

But the Herald quoted Morris Mtsambiwa, Zimbabwe Parks and Wildlife Management Authority director general, as saying he was "equally concerned about the proper management of the black rhino" and that the animals were safe.

Zimbabwe was working on relocating black rhinos to the southeastern Gonarezhou National Park, which is part of the southern African Great Limpopo Transfrontier Park, he said.

"We are still working on the logistics, but at the moment the rhinos are safe with the successful creation of intensive zones," Mtsambiwa said.