A bull Hippopotamus dozes in the Ruaha River during the heat of the day. Male hippos have to set out a territory that they will vigorously defend a

---

A bull Hippopotamus dozes in the Ruaha River during the heat of the day. Male hippos have to set out a territory that they will vigorously defend against all intruders

---

Size: 5500px × 3667px
Location: Ruaha National Park, Tanzania
Photo credit: © Nick Greaves / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: adaptation, africa, aggressive, agonistic, amphibious, ancodonta, aquatic, artyodactyla, bull, canines, communication, daytime, declining, dentition, endemic, environment, evolution, family, fighting, glands, grazer, habitat, hairless, hippo, hippopotamus, hippotamidae, incisors, jaw, mammal, man, markers, melanin, molars, national, nature, night-time, numbers, park, pink, placental, posture, resting, ruaha, safari, sebaceous, secretion, sensitive, skin, skull, social, solitary, sunburn, sweat, tanzania, territorial, thermoregulation, vegetarian, vertebrate, vocal, whippomorphia, wildlife