Bulbul birds! Oh crap, another introduced pest I have to worry about. Just looked them up - I guess there everywhere on Oahu, but DLNR website says:
"Big Island: Several sightings around the Mauna Lani area on the Kona side, sighting near Hilo. All sightings should be reported to BIISC or HDOA."
I don't recall ever seeing them here. I'm down at the southern tip of the Big Island. I'll try to take out any bulbul I see. They may be delicious too!