Naturalis Biodiversity Center is a national museum of natural history and a research center on biodiversity in Leiden, Netherlands. Although its current name and organization is relatively recent, its history can be traced back to the early 1800s. Its collections contain approximately 37 million specimens, one of the largest natural history collections in the world. In late 2016 the center closed its main building for renovations, with plans to re-open in late 2018. Temporary exhibitions are open in the pesthuis entrance building during the renovations. The current museum is known for the numerous objects in its collections. Prior to the merger with the Zoölogisch Museum Amsterdam and National Herbarium of the Netherlands, there were approximately 10 million zoological and geological specimens in the Naturalis collection. Following the merger with the collections of the Zoölogisch Museum Amsterdam and National Herbarium of the Netherlands in 2010-12, there are now approximately 42 million specimens.

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