Sioux Falls zoo's surviving tiger cub up to 30 pounds

A rare tiger cub born at the Sioux Falls zoo now weighs 30 pounds and is starting to get acquainted with other big cats.

The Amur tiger cub, named Callie, is the lone survivor of a litter of six born in July at the Great Plains Zoo.

Zookeepers are taking her outside the veterinary building where she's lived since birth and will start introducing her to the Asian cat exhibit. The cub eats about 20 ounces of formula and 35 ounces of cat food daily.

She was born as part of a captive breeding program involving Amur tigers, who grow to 500 pounds. There are believed to be about 400 Amur tigers in the wild.

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