Nigersaurus was relatively small for a Sauropod dinosaur - it was about 30 feet (9 meters) long and weighed about 4 tons. Its bones were hollow and had many air spaces, and as a result, fossils do not tend to be well-preserved and it was poorly known until recently.
The most unusual feature of Nigersaurus was its style of feeding. Its mouth was the widest part of its head and was equipped with several hundred small sharp teeth. As one tooth wore out, it was replaced by another (up to 9 replacement teeth lay behind each cutting tooth), perhaps as often as once per month. Nigersaurus is believed to have eaten like a lawn-mower, taking it predigious quantities of low-lying vegetation.
Nigersaurus is also noted for having neural spines on its vertebrae. In life, flesh or skin was probably stretched between these.
Nigersaurus was a herbivore (plant-eater) that lived from 119 to 99 million years ago
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