Generally, crocodiles have a longer lifespan in captivity. Saltwater crocodiles can live up to 70 years. Crocodiles of all species will have an average lifespan of at least 30 to 40 years. ‘Donna’ is the name of a female hippo that lived for 61 years at the Mesker Park Zoo in Evansville, Indiana, in the US. The average lifespan counted in captivity is 50 years. Lifespan Hippopotamus’s average lifespan is 40 to 50 years. The number of eggs that crocodiles lay at a time may vary in number for different types of crocodiles. They lay eggs, and also females and males mate to reproduce. Sexually, the nature of crocodiles is dimorphic. The male one forces the female one during mating, and the female one remains submerged in the water. Reproduction The hippopotami are polygamous, and a female one is capable of giving birth to one calf each year under good conditions. The Saltwater region is also a favorite place for them. They usually live near water lands, lakes, rivers. Crocodiles live in the tropical habitats of Africa, Australia, and Asia. As hippopotamuses like to spend most of their time in the water, they usually live near the water sources. Habitat Hippopotamuses are found in sub-Saharan Africa. Crocodiles spend most of their time in the water, and also they can move several miles overland. Male crocodiles are aggressive during mating season. Nile crocodiles are the most aggressive ones among all other crocodiles. ![]() Habitually, 10 to 30 hippos form such a group. Hippos stay in groups, and usually, one male Hippopotamus leads the group. They use their large teeth to face different threats. Behavior Hippos are considered one of the most aggressive animals in the world. The bite force of a mature crocodile is 3700 pounds per square inch. Bite Force The bite force of a mature hippo is 1800 pounds per square inch. However, it cannot open its mouth as wide as the hippopotami can. It moves its upper jaw only while biting. An adult Hippopotami will have 36 teeth, and its mouth is roomy enough to hold those teeth. Mouth A Hippopotamus has a large mouth, and it can open its mouth at almost 180 degrees. For example- it is used to make bags, shoes, and other leather products. Its skin has different applications in the leather industry. ![]() Crocodiles have bony skin on their back and comparatively soft skin in the lower part of the body. A hippopotamus has a skin of 6 cm thick, and this thick skin protects other predators. Skin Hippopotamuses are somewhat different from any other semi-aquatic animals. All these species are divided into three families-Alligatoridae, Crocodylidae, Gavialidae. The other one is the pygmy Hippo which belongs to the Choeropsis or Hexaprotodon genus in the family Hippopotamidae. Comparison Chart in detail: Comparison with Hippopotamus Crocodile Scientific name Hippopotamus amphibius Crocodylinae Species The family of Hippopotamidae has two extant species.
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