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River Conditions Were Linked to Hippo Behaviour in Cameroon

Group of wild common hippopotamuses resting together in water
Research · Behaviour

Observations in Mbam et Djerem National Park in Cameroon found associations between the visible condition of river water and the behaviour of common hippopotamuses (Hippopotamus amphibius). The researchers recorded water colour alongside the animals’ activities, surrounding vegetation and time of day.

Fieldwork lasted four months. Observations were made three times a day on four days in each month. The team used the physical colour of the water as an indicator to estimate pollution level, distinguishing clear, turbid and deep-brown conditions while simultaneously recording hippo behaviour and surrounding vegetation.

Turbid water dominated the observations

Seventy per cent of the recorded water conditions were classified as turbid, while 12% were classified as deep brown. Water appearance was significantly associated with the time of day, and the vegetation recorded around the aquatic habitat also varied with water condition.

The recorded behaviour of the hippos also varied with visible water condition. According to the study, clearer conditions were linked with more social interaction and more efficient foraging, while turbid or deep-brown conditions coincided with changes in activity and use of the water.

Water colour was used as the field indicator

The study classified river conditions from visible colour and turbidity and used these physical categories as its field indicator of water quality. The authors report significant associations between these categories and time of day, surrounding vegetation and hippo behaviour.

They recommend continued monitoring and management of river-water quality, measures to reduce pollution and further long-term research on how changing water conditions affect hippo populations.

The study was published in American Journal of Life Sciences on 28 March 2026.

Sources and image credit

  1. Maurice, M. E., Nestor, F. T., Akuh, E. B., Nadine, E. K., Ebong, N. E., et al. (2026). The Effect of River-water Quality on Behaviour of Hippopotamus (Hippopotamus amphibious) in Mbam et Djerem National Park, Cameroon. American Journal of Life Sciences, 14(2), 19–29. https://doi.org/10.11648/j.ajls.20261402.11Primary open-access research article, published 28 March 2026.

Image: Paul Maritz / Wikimedia Commons — wild common hippopotamuses in the Luangwa Valley, Zambia; representative species image; cropped to 16:9 · CC BY-SA 3.0 · Source

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