Behaviour
Little is known of the Invisible Rail's life cycle. Its diet consists mainly of plant shoots, vegetation matters and insects. They also feed at open cuts of sago trunks. The call is drum-like sound (hence the common name drummer) with a loud scream. Flightlessness in birds is known to be related to changes in the pectoral girdle, flight feathers and body size, and was once speculated to also be related to brain size in birds. However, this has been proven to generally not be correlative to the flight capability of birds, except there is a correlation of flightlessness to small brain size in the Great Auk (Pinguinus impennis), the Kakapo (Strigops habroptilus) and some species of penguin. Breeding is in pairs and 4–5 chicks are hatched. Local people feel that during the dry season this bird leaves the forest.
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—Donald Davidson (b. 1917)