Ivory poachers have killed more than 80 elephants in Zimbabwe by poisoning watering holes with cyanide, a minister said.
Members of Zimbabwe's opposition say they have been targeted by Mugabe supporters following the president's re-election.
President Robert Mugabe's declaration as winner has been met by international concern over the conduct of the African nation's poll.
Zimbabwean President Robert Mugabe has launched an attack on critics of his disputed re-election, telling them bluntly to "go hang".
In his first public address since his election win, Mr Mugabe dismissed his rivals as "Western-sponsored stooges" at a liberation war commemoration.
The leader of Zimbabwe's Movement for Democratic Change party and Mr Mugabe's main rival, Morgan Tsvangirai, boycotted the rally as allegations of election fraud continued.
Zimbabwean President Robert Mugabe told critics of his disputed re-election to "go hang" dismissing his rivals as "Western-sponsored stooges" at a liberation war commemoration that was boycotted by his principal challenger, Morgan Tsvangirai.
Speaking in the local Shona language, in colloquial phrases he does not usually use when speaking in English, Mugabe called on Tsvangirai to accept defeat:
"Those who are smarting from defeat can commit suicide if they so wish. But I tell them even dogs will not sniff at their flesh if they choose to die that way," he said.
He described Tsvangirai as the "enemy" in his party's midst during the shaky coalition brokered by regional leaders after the last disputed and violent poll in 2008.
"We have thrown the enemy away like garbage. They say we have rigged, but they are thieves"
Zimbabwe's MDC party has filed papers in the Constitutional Court challenging Robert Mugabe's election win.
My lawyers are at court filing papers challenging validity of July 31 poll
Botswana's government has disputed the result of Zimbabwe's general election which saw the long-standing president Robert Mugabe claim a landslide victory.
Its assessment stands in stark contrast with that of South Africa, which has congratulated Mr Mugabe on his victory.
Both nations belong to the Southern African Development Community which monitored the vote, and now appears to be divided.
The Botswana government said that although the election day itself had been "free of overt intimidation and violence", the electoral process "cannot be considered as an acceptable standard for free and fair elections".
Zimbabwe's main stock market index fell 11 percent on Monday in its first trading day since official results confirmed President Robert Mugabe would extend his 33 years in power.
The industrial index fell to 205.57 points in the mid-morning session, with all the top-ten shares save for the local unit of insurance giant Old Mutual trading in the red.
Young Zanu-PF supporters from the Mbare area of Harare, Zimbabwe have been celebrating in the streets following Robert Mugabe's victory in the country's presidential election.
The president of South Africa has congratulated Zimbabwean leader Robert Mugabe on his re-election.
Jacob Zuma's approval is in sharp contrast to Western governments which questioned the credibility of a rushed, disputed vote.
African monitors broadly approved the conduct of the Zimbabwe election, but Mugabe's main rival, Movement for Democratic Change (MDC) leader Morgan Tsvangirai, has said he will challenge the results in court with evidence of massive vote-rigging, irregularities and intimidation.
One of Zimbabwe's leading Sunday newspapers has reported that President Mugabe "romped" to victory in the country's election.
The Sunday Mail is part of a group of newspapers owned by the government and has been criticised by the opposition for its support of Zanu-PF.