This bird is a type of partridge called a Gray Francolin. I noticed it because it was screaming bloody murder at the top of a fence post along the Ka'anapali Beach Walk trail that passes between the ocean and the Ka'anapali Golf Course. When I stopped to observe it, I noticed a group of Gray Francolins wandering about below the fence.
As many times as I have visited Hawaii, I've never noticed this bird before. But it's sorta like when you spot a new make of automobile on the freeway or worse, you buy such a unique vehicle, and then it's ubiquitous. You can't get away from it. When I returned to my hotel, I found another on the bench and got better photos of that one.
Along the walk, I visited the Sheraton Black Rock, the Ka'anapali Golf Course, some sort of water diversion with lava rocks, another beach, several private beaches, and finally arrived at the Royal Lahaina for a lunch, which I shared with a barred dove. For those of you who are interested in such, all of those photos and more are found in my personal blog today at this link: Post Card Perfect Ka'anapali Beach Walk to Royal Lahaina.