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This contest is fueled by the following news: Brazil's army has started drafting a low-tech but effective transporter for its Amazon operations to complement its modern military arsenal -- water buffalo.
The sturdy horned animals can easily carry supplies and munitions in remote areas where there are no roads, fuel is scarce, or rivers are too shallow to navigate, officers say.
"The buffalo have had excellent operational results and increased the distances we can cover," General Eduardo Dias da Costa Villas Boas, the chief of the Brazilian Army in the Amazon, said on Friday.
They weigh about 500 kg (1,100 pounds) and can carry the same amount, he added.
Each base along the border was sent three water buffalo last year. The program will be expanded once tests of newly designed cargo packs are completed.
The Army gets the docile and disease-resistant animals from Marajo Island, a land mass the size of Switzerland at the mouth of the Amazon River. Portuguese settlers brought them to Brazil from Asia centuries ago.
"They don't require gasoline or special food. Buffalo eat anything," Villas Boas said.