PORTLAND One of the Oregon Zoo s new African lion cubs has been taken from the den and put into special supportive care because she appears to be sick.

Zoo veterinarians said the cub stopped nursing last week and also kept going off by itself.

We did a well-baby check, found her to be dehydrated, found her to be low body weight compared to the other two, and so we had some concern, said Chris Pfefferkorn, Oregon Zoo deputy director.

Veterinarians also found that the cub's body temperature was not stabilizing at a normal level. That s when they decided to put her in a heated cage where she can be kept under close watch and fed formula.

She is currently getting supportive care and we are hopeful that we can get her back with mom and sisters soon, said zoo spokesman Hova Najarian. The staff is doing a great job of caring for this little cub. We are hopeful, but at the same time realize that her situation is still guarded.

The cub s two sisters continue to thrive and are growing at a normal rate, Najarian added.

Photos: Lion cubs get checkup at Oregon Zoo

The three cubs were born September 7. It was the first pregnancy for their mother, Neka, and zoo veterinarians said she has been an amazing new mom.

Background: 3 lion cubs born at Ore. Zoo

Raw video: Lion cubs with Neka in den

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