Guam Birds: Wat type of Birds live on Guam in the Wilderness?

"The avifauna of Guam includes a total of 95 species, of which 2 are endemic, 2 have been introduced by humans, and 1 is rare or accidental. 4 species listed are extirpated in Guam and are not included in the species count."

Micronesian Scrubfowl Megapodius laperouse (Ex)
Guam Rail Gallirallus owstoni (*EW)
Nightingale Reed-Warbler Acrocephalus luscinia (Ex)
Guam Flycatcher Myiagra freycineti (*E)

(*) Endemic A species either entirely confined to Guam in its natural distribution, or a species whose breeding range is entirely confined to Guam.
(E) Extinct A recent member of the avifauna that no longer exists.
(EW) Extinct in the Wild These species only exist in captive breeding programs, with no documentation of wild birds found in native habitats.  
(Ex) Extirpated A species that no longer occurs in Guam populations exist nowhere.

That means the Guam Rail and Guam Flycatcher are the only 2 birds endemic to Guam, and both are extinct in the wild.  Presumably there are still some Guam Rail birds in captivity.