By Brian Snelson from Hockley, Essex, England - Hippos
Uploaded by Snowmanradio, CC BY 2.0, Link
_(6081008830).jpg#/media/File:Hippopotame_(Zoo_de_Berlin)_(6081008830).jpg)
By Jean-Pierre Dalbéra from Paris, France - Hippopotame (Zoo de Berlin), CC BY 2.0, Link
By Chris Muenzer - Flickr, CC BY 2.0, Link
By Chris Muenzer - Flickr, CC BY 2.0, Link