A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.

This Aug. 6, 2015, file photo, shows prairie dogs in southern Utah. Badlands National Park officials in South Dakota have confirmed from testing Friday that the plague killed a large group of ...

A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.

A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.

A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.

A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.

A ferret eats a prairie dog about every three days, while the average ferret family will need about 250 prairie dogs a year, NPS explains. In February, a case of human plague was confirmed in Oregon.