A baby lion and a baby monkey play at the Guaipo Manchurian Tiger Park in Shenyang, capital of northeast China's Liaoning Province, April 19, 2013. The 32-day-old baby lion and the 16-day-old monkey have become intimate friends. They are both fed by keepers after birth as their mothers lack breast milk. (Xinhua/Yao Jianfeng)

A baby lion and a baby monkey play at the Guaipo Manchurian Tiger Park in Shenyang, capital of northeast China's Liaoning Province, April 19, 2013. The 32-day-old baby lion and the 16-day-old monkey have become intimate friends. They are both fed by keepers after birth as their mothers lack breast milk. (Xinhua/Yao Jianfeng)

A baby lion and a baby monkey play at the Guaipo Manchurian Tiger Park in Shenyang, capital of northeast China's Liaoning Province, April 19, 2013. The 32-day-old baby lion and the 16-day-old monkey have become intimate friends. They are both fed by keepers after birth as their mothers lack breast milk. (Xinhua/Yao Jianfeng)

A baby lion and a baby monkey play at the Guaipo Manchurian Tiger Park in Shenyang, capital of northeast China's Liaoning Province, April 19, 2013. The 32-day-old baby lion and the 16-day-old monkey have become intimate friends. They are both fed by keepers after birth as their mothers lack breast milk. (Xinhua/Yao Jianfeng)