A spokesman for the environment ministry said: "we know what is happening in the Chaco but there's little we can do."

环境部发言人说：“我们对查科所发生的一切了如指掌，但我们却无能为力。”

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Ignacio Rivas, a conservationist with the Paraguayan group Guyra, said: "the fate of the Chaco lies with these groups."

巴拉圭一位环保人士伊格·纳西奥·里瓦斯指出：“查科的命运掌握在这些共同体手里。”

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The large Mennonite families and powerful co-operative farm groups have bought an estimated 2m hectares of land in the Chaco.

几户大的门诺教家庭和具备实力的合作农场在查科购买的土地超过200万公顷。

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Grass-cutting ants occur in the Chaco region of north Argentina and Paraguay and belong to a subgroup of leaf-cutting ants that specialise in harvesting grass leaves.

BBC: Earth News - Ant's head balancing act revealed by video

It's a bitter blow for the museum, and for the plants and animals of the Gran Chaco, which is threatened by illegal logging and forest clearance for agriculture.

BBC: Paraguayan expedition abandoned

Paulson Chaco is Director of the Navajo Division of Transportation occupying a cabinet level position to the President of the Navajo Nation.

WHITEHOUSE: Champions of Change Blog