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- action
- Africa
- aggression
- amphibius
- Animalia
- Appendix II
- Aquatic
- Artiodactyla
- behaviour
- Cetartiodactyla
- Chordata
- Chordates
- conflict
- even-toed ungulates
- fighting
- freshwater
- gape
- Grassland
- hippo
- Hippopotamidae
- Hippopotamus
- Hippopotamuses
- IUCN Red List
- jaws
- mammalia
- mammals
- Omnivorous
- Ponds and lakes
- rival
- rivalry
- splash
- Streams and rivers
- Terrestrial
- Ungulates
- vertebrate
- Vulnerable
- wallow
- water
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