Families look at giant panda Da Mao at the Toronto Zoo in Toronto, Canada, on May 18, 2013. Er Shun and Da Mao, the two giant pandas on a 10-year loan from China, made their first public appearance in their new home at the Toronto Zoo on Saturday. (Xinhua/Zhang Ziqian)

A band from Canada Navy plays at the Toronto Zoo in Toronto, Canada, on May 18, 2013. Er Shun and Da Mao, the two giant pandas on a 10-year loan from China, made their first public appearance in their new home at the Toronto Zoo on Saturday. (Xinhua/Zhang Ziqian)

A girl makes sketches of giant panda Da Mao at the Toronto Zoo in Toronto, Canada, on May 18, 2013. Er Shun and Da Mao, the two giant pandas on a 10-year loan from China, made their first public appearance in their new home at the Toronto Zoo on Saturday. (Xinhua/Zhang Ziqian)

Visitors pose with a giant panda model at the Toronto Zoo in Toronto, Canada, on May 18, 2013. Er Shun and Da Mao, the two giant pandas on a 10-year loan from China, made their first public appearance in their new home at the Toronto Zoo on Saturday. (Xinhua/Zhang Ziqian)

A staff with fresh bamboos in hand distributes guides to visitors at the Toronto Zoo in Toronto, Canada, on May 18, 2013. Er Shun and Da Mao, the two giant pandas on a 10-year loan from China, made their first public appearance in their new home at the Toronto Zoo on Saturday. (Xinhua/Zhang Ziqian)