QINGDAO, CHINA - MAY 22: (CHINA OUT) <br />
<br />
Worker Clean Hippo's Teeth<br />
<br />
A worker cleans a hippo's teeth at Qingdao Forest Wildlife Park on May 22, 2014 in Qingdao, Shandong Province of China. Workers at the park clean hippos' teeth twice a week in summer.<br />
©Exclusivepix