What's the difference between megapode and moundbird?

Megapode

Definition:

(n.) Any one of several species of large-footed, gallinaceous birds of the genera Megapodius and Leipoa, inhabiting Australia and other Pacific islands. See Jungle fowl (b) under Jungle, and Leipoa.

Example Sentences:

(1) Both this and the scrubfowl are megapodes (which literally means ‘big feet’), whose hard-working males build a huge mound out of leaves and earth where the female lays her eggs, which are incubated by the heat provided by the rotting vegetation.
(2) Artificial incubation is also practised by birds belonging to the family of the Megapodes: the Brush Turkey and the Mallee Fowl build a mound and maintain the required temperature of the eggs laid in it.