Hrošík zakrslý (Choeropsis liberiensis) v zoologických zahradách ČR a jeho kostermí materiál v Národním muzeu v Praze (Cetartiodactyla: Hippopotamidae) [Choeropsis liberiensis in the zoological gardens of the Czech Republic and its osteologi
The presented data are based on the evidence of the pygmy hippopotamus breeding in six zoological gardens of the Czech Republic in 1934–2017. The Prague and Ústí nad Labem Zoos finished its keeping at the beginning of the 21th century due to technical reasons; Dvůr Králové, Jihlava, Olomouc and Plzeň Zoos continued. The respective zoos maintained altogether 75 individuals, 24 were imported and 51 were born. The births were registered in the period 1986–2017: 24 in Dvůr Králové, ten in Ústí nad Labem, seven in Olomouc, five in Jihlava, four in Prague and one in Plzeň. The earliest births were documented in two females which both delivered at the age of 5 years and 8 months. Both these females also showed the highest number of young documented in the Czech zoos (nine each). The births occurred especially in autumn and early spring seasons. The shortest period between two subsequent births in the same female was 1 year, 2 months, 25 days. The sex ratio of the young was 18 : 33 (♂:♀). Of the 51 juveniles, eight (6 ♂♂ : 2 ♀♀) died on the day of birth, four (2 : 2) during the first week and three (0 : 3) within the first half of the first year. The longest age, almost 38 years, was reached by a female from the Dvůr Králové Zoo.