A hippopotamus photographed at San Antonio Zoo in Texas.
Photograph by Joël Sartore, National Geographic Photo ArkA hippopotamus photographed at San Antonio Zoo in Texas.
Photograph by Joël Sartore, National Geographic Photo ArkA hippopotamus photographed at San Antonio Zoo in Texas.
Photograph by Joël Sartore, National Geographic Photo ArkA hippopotamus photographed at San Antonio Zoo in Texas.
Photograph by Joël Sartore, National Geographic Photo ArkA hippopotamus photographed at San Antonio Zoo in Texas.
Photograph by Joël Sartore, National Geographic Photo Ark