Count Hippo, Count: Learning Numbers (Hippopolis)

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Eltringham SK. The hippos: Natural history and conservation. London (UK): Poyser Natural History; 1999. 184 p.

Drone-based effective counting and ageing of hippopotamus (Hippopotamus amphibius) in the Okavango Delta in Botswana The models show that sun reflection has a highly significant negative effect on both the detection rate of hippos and observer confidence ( Table 4). Complete cloud cover also significantly affects the LC, while its effect is less significant for the DR. Both DR and LC decrease with increasing flight height, although it is more significant for LC. Observer experience affects both models, being highly significant for DR but less important for LC.Delvingt W. Les recensements des hippopotames (Hippopotamus amphibius L.). Etude méthodologique en vue du choix d’un système de dénombrement. Cahier D’Ethologie Appliquée. 1985;5(1):31–50. Skinner JD, Scorer JA, Millar RP. Observations on the reproductive physiological status of mature herd bulls, bachelor bulls, and young bulls in the hippopotamus Hippopotamus amphibius amphibius Linnaeus. Gen Comp Endocrinol. 1975;26(1):92. pmid:1132668

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Graham LH, Reid K, Webster T, Richards M, Joseph S. Endocrine patterns associated with reproduction in the Nile hippopotamus ( Hippopotamus amphibius) as assessed by fecal progestagen analysis. Gen Comp Endocrinol. 2002;128(1):74–81. pmid:12270790