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- Africa
- agression
- amphibius
- Animalia
- Appendix II
- Aquatic
- Artiodactyla
- b&w
- behaviour
- black and white
- black and white photography
- Cetartiodactyla
- Chordata
- Chordates
- defence
- Even-toed Ungulates
- fight
- fighting
- Grassland
- hippo
- Hippopotamidae
- hippopotamus
- Hippopotamuses
- hippos
- IUCN Red List
- Mammalia
- Mammals
- mouth
- Omnivorous
- Ponds and lakes
- river
- splash
- Streams and rivers
- teeth
- Terrestrial
- Vulnerable
- water
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