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In page Nyai Roro Kidul:

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There are three harvests, which are known as the Unduan-Kesongo, Unduan-Telor, and Unduan-Kepat, taking place in April, the latter part of August, and December. Rongkob and Karang Bolong along the south coast of central Java are famous for their edible bird's nests, made by so-called little sea swallows (actually Collocalia fuciphaga, called Salanganen). The harvests are famous for the wayang performances and Javanese ritual dances, accompanied by gamelan music.[citation needed]