A southern pochard duck cleans the head of a hippo at the zoo in Berlin. Six of these ducks were introduced to the hippo enclosure at the beginning of this year.
PHOTO: Michael Sohn/AP Photo
A southern pochard duck cleans the head of a hippo at the zoo in Berlin. Six of these ducks were introduced to the hippo enclosure at the beginning of this year.
PHOTO: Michael Sohn/AP Photo
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