An American bison stands in a field on the Tallgrass Prairie Preserve in Oklahoma.

一只北美野牛伫立在俄克拉荷马州的高草草原保护区。

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Tallgrass prairie once blanketed some 140 million acres (57 million hectares) of North America, but more than 95 percent has vanished.

Tallgrass大草原一度覆盖近似140百万英亩（57百万公顷）的北美，但超过95％已经消失。

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Tallgrass prairie once blanketed some 140 million acres (57 million hectares) of North America, but more than 95 percent has vanished.

Tallgrass大草原一度覆盖近似140百万英亩（57百万公顷）的北美，但超过95％已经消失。

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