The orangutan will undergo a type-B ultrasonic test at the hospital. [hangzhou.com.cn]

Two baby orangutans and a lion cub at Hangzhou Wild Animal Park were found to have developed kidney stones after being fed tainted Sanlu milk for more than a year.

The orangutan called "Qi Mao" was found to be afflicted with kidney stones after careful keepers noticed her urine was yellowish and sent her to Hangzhou Zhangxu Animal Hospital for a checkup.

"Sanlu milk had been her staple food since she was weaned from the breast," said Wang, the keeper at the park, clearly worried about her health condition.

Apart from "Qi Mao", a three-year-old orangutan and a three-month-old lion cub at the park also fell victim to the tainted milk.

"Those animals are all listed as endangered species. An orangutan is worth more than 100 thousand yuan," said Wang.

"The new-born carnivores are usually fed milk powder after two months' breast feeding," said Wang. "Two years ago, we tried many brands, domestic and imported. It turned out that Sanlu was the best, but we stopped feeding them Sanlu after it was found to be contaminated."

The veterinarian said it was fortunate to have sent them for an early checkup as the stones in their urine turned out to be very small.

Over the next few days, the park workers will bring the urine of all the animals that were nursed with Sanlu to hospital for checkup.

The orangutan will undergo a type-B ultrasonic test at the hospital. [hangzhou.com.cn]