However, the hippo calf is about 10 times larger than a … whales Advertisement. The gestation periods of the animal kingdom are varied and fascinating. The gestation period takes 8 months. Some clock in at just a few weeks, making any human green with envy, while others can last more than a year. Hippos are most closely related to: cows. They have a gestation period of eight months. Males mature at about 7.5 years of age. eight months. How long is the hippo gestation period? Calves are often left in creches guarded by one to several cows. A study of endocrine systems suggests that female hippies can begin puberty at the age of three or four. Hippos tend to live in groups, which can be as large as 100. The gestation period is just 8 months, only slightly shorter than the human gestation period. The young are born after a gestation period of eight months and maturity is only achieved at about 3 and a half years. Explore More Quizzes. Mating takes place in the water with the female under water during most of it. Right after its birth, the baby can walk, run or swim. Advertisement. Hippo calves will live beside their mothers until the age of 7 or 8. As can be seen in the chart, apes (including humans), monkeys, big cats, and rodents can be clearly grouped according to their gestation period. Hippo Reproduction. They have a gestation period of 240 days, and babies are usually born underwater. The platypus and 4 species of echidnas do not give birth to live young, despite being a mammal. The female hippo reaches sexual maturity between five and six years of age. They mate in the water. The female gestation period lasts eight months and produces just one offspring (this is rather fortunate, given they can weigh 110 pounds on birth). At 18 months from birth, the calves are fully weaned and leave their mother when they are 7-8 years old. Female hippos reach sexual maturity at five to six years of age and have a gestation period of eight months. Male hippos (bulls) will reach sexual maturity after 7 years, and females (cows) after 9 years. Raising a hippo. Gestation Period in Days : 15-20. Pregnant hippopotamus facts. TRIVIA. One calf is born underwater. Although like many other activities (including mating) the Hippopotamus often gives birth in the water, it is not actually that uncommon for their young to be born on land. Can You Identify These Highly Intelligent Animals? Males reach sexual maturity by the time they reach 7 or 8 years of age. After a gestation period that lasts for around eight months, the female Hippopotamus gives birth to a single calf generally during the rainy season. The cub rides on it mother’s backs for safety and its mother strongly protects it. Fortunately, hippos make much more pleasant parents than dates, or at least the females do. 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