Robert Muir of the Frankfurt Zoological Society, who accompanied Ngobobo, said: "We need to impress on Nkunda and his men that it is inexcusable to destroy national and world heritage of such critical importance. ... Now that we know that the slaughtered gorilla was eaten, the gorillas habituated for tourism are at extreme risk - and we are worried that more have been killed already."

The last remaining hippo populations in Congo are in Virunga and are also on the verge of being wiped out. Conservationists have blamed rebels and militias for slaughtering them, and say more than 400 were killed last year, mostly for food. Only 900 hippos remain, a huge drop from the 22,000 reported there in 1998.

Virunga park has been ravaged by poachers and deforestation for more than a decade. The 1994 Rwandan genocide saw millions of refugees spill into Congo, marking the beginning of an era of unrest, lawlessness and clashes between militias and rebel groups.

Mineral-rich Congo, which held its first democratic elections in more than four decades last year, is struggling to recover from a 1998-2002 war that drew in the armies of more than half a dozen African nations.

The job of protecting the country's parks falls on local rangers, and the risks are high. In Virunga alone, some 97 rangers have died on duty since 1996, the Africa Conservation Fund said.

On his blog, Ngobobo also described being shot at and beaten by the military, who he and other rangers were trying to persuade to stop cutting down the forest.

Richard Leakey, a conservationist credited with helping end the slaughter of elephants in Kenya during the 1980s, said: "The survival of these last remaining mountain gorillas should be one of humanity's greatest priorities. Their future lies with a small number of very brave rangers risking their lives with very little support from the outside world."

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