A territorial Hippo 'yawns' in a typical threat display. These aggressive animals have to put on impressive displays to deter competing males

---

A territorial Hippo 'yawns' in a typical threat display. These aggressive animals have to put on impressive displays to deter competing males from encroaching on their territory

---

Size: 5500px × 3625px
Location: Katavi National Park, Tanzania
Photo credit: © Nick Greaves / Alamy / Afripics
License: Licensed
Model Released: No

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