The four week old baby hippopotamus discovers the indoor enclosure under the eyes of mother Ayoka at the zoo in Duisburg, Germany, Friday, Jan. 9, 2015. The male hippo is her first offspring and is about to learn swimming. (AP Photo/Frank Augstein)
The four week old baby hippopotamus discovers the indoor enclosure under the eyes of mother Ayoka at the zoo in Duisburg, Germany, Friday, Jan. 9, 2015. The male hippo is her first offspring and is about to learn swimming. (AP Photo/Frank Augstein)
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