为挽救余下的兽群及其栖息地，国家公园管理部门正计划杀掉2000头大象。
To save remaining herds and habitat, the national parks department is planning to cull 2000 elephants.
一种观点认为，这些画是兽群季节性迁徙的记录。
One opinion is that the paintings were a record of seasonal migrations made by herds.
起初，他们控制了兽群的迁移以确保获得稳定的肉食来源。
At first, they controlled the movement of the herd while ensuring continuance of their meat diet.
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