A black-tailed prairie dog perks up outside his burrow in South Dakota.

在南达科他州，一只黑尾巴的草原土拨鼠昂首站在他的洞穴外面。

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According to the Fish and Wildlife Service, only seven major (bigger than 10, 000 acres) black-tailed prairie dog towns remain.

ECONOMIST: An endangered nuisance

Only one state, South Dakota, remains plague-free, and it contains about a third of the remaining black-tailed prairie-dog population.

ECONOMIST: An endangered nuisance