The Guam rail is a secretive, flightless, territorial species that is most easily observed as it bathes or feeds along roadsides or field edges.
The Mariana crow is also known as the aga in Chamorro, one of the native languages of the Mariana Islands
The calls are regularly heard at first light of dawn, though the birds will sometimes call at night. Calls are voiced with such regularity that, according to local belief, they can be used to tell time.
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A flightless bird, the Ko’ko is omnivorous and prefers mixed forest. It is easy prey for monitor lizards, cats, rats, and the brown tree snake. Breeding programs have been set up to eventually reintroduce this treasured bird to Guam.