A pair of 10-day-old sibling lion cubs are seen in their play area at the San Diego Zoo and Safari Park animal care center in San Diego, California, in this December 16, 2013 handout provided by the San Diego Zoo and Safari Park. The brother and sister, whose mother Oshana was not giving them the attention they need to thrive, are receiving bottles of formula every two hours from animal care staff, according to the zoo. (Ken Bohn/San Diego Zoo/Handout via Reuters)
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