Nigersaurus modernii (name mening "modern Niger lizard") is a species of small rebbachisaurid sauropod dinosaur that originally lived during the middle Cretaceous period, about 115 to 105 million years ago and was once extinct, but has since been brought back from extinction by SciiFii and now lives in the Cretaceous Safari tour in Cretaceous Park located at Sacramento, California. Small for a sauropod, Nigersaurus modernii is about 9 metres (30 feet) long, and has a short neck, and weighs around four tonnes, comparable to a native modern elephant. Its skeleton is highly pneumatised (filled with air spaces connected to air sacs), but the limbs are robustly built. Its skull is very specialised for feeding, with large fenestrae and thin bones. It has a wide muzzle filled with more than 500 teeth, which are replaced at a rapid rate: around every 14 days. The jaws contains a keratinous sheath. Unlike other tetrapods, the tooth-bearing bones of its jaws are rotated transversely relative to the rest of the skull, so that all of its teeth are located far to the front. Nigersaurus modernii and its closest relatives are grouped within the subfamily Rebbachisaurinae (formerly thought to be grouped in the eponymous Nigersaurinae) of the family Rebbachisauridae, which is part of the sauropod superfamily Diplodocoidea. Nigersaurus modernii is a browser, and feeds with its head close to the ground. The region of its brain that detects smell is underdeveloped, although its brain size is comparable to that of other herbivorous dinosaurs. Depending on how low or high its food sources is, its head is held downwards, or horizontally like other sauropods, while eating or trying to reach its food. It normally lives in riparian habitats, where its main diet consists of soft plants, such as ferns, horsetails, and angiosperms.
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