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They do not incubate their eggs with their body heat in the orthodox way, but bury them. They are best known for building a massive mound of decaying vegetation, which the male attends, adding or removing litter to regulate the internal heat while the eggs hatch. The species in taxonomic order are:
In all of the above, the name "scrubfowl" is sometimes exchanged with "megapode". Traditionally, most have been listed as subspecies of M. freycinet, but today all major authorities consider this incorrect. Nevertheless, there are unresolved issues within the genus, and for example the taxonforstenii has been considered a subspecies of M. freycinet, a subspecies of M. cumingii, or a monotypic species. An additional species, the Moluccan megapode, has sometimes been placed in Megapodius, but today most place it in the genus Eulipoa instead. The maleo is also associated with these genera, and together the three form a group.