Madu were a coconut-like fruit found on the island of Mata Nui. Their juices were extremely volatile, and so the fruit was known to explode. Madu grew on trees.1
Madu trees grew in Le-Wahi.2
Le-Matoran could play lively music on a Madu-shell xylophone.3
Unripe Madu were known as Madu Cabolo.4