"Open Wide!"
Adult males may hold the same territory for several years in stable lake communities. These dominant males can change every month in less stable river areas. Males use many threat displays including yawning (with or without water scooping), head shaking, rearing, roaring, grunting and dung showering. Defensive or submissive displays include facing the aggressor with mouth open, turning tail, slow tail-paddling while urinating, lying prone and flight. Fighting may consist of tusk clashing, rearing and pushing with lower jaws entangled, slashing and biting.
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