I was thinking flicker of some kind. It's not a big bird. S/he has a yellowish head. The underside is creamy off white. The upper body has larger black stripes with smaller white stripes horizontally. The tail is larger black and white stripes. I know the darling loves my tree.? For now s/he's a daily visitor.Take a look at pix and description of Northern Flicker
Northern Flicker Overview, All About Birds, Cornell Lab of Ornithology
Northern Flickers are large, brown woodpeckers with a gentle expression and handsome black-scalloped plumage. On walks, don’t be surprised if you scare one up from the ground. It’s not where you’d expect to find a woodpecker, but flickers eat mainly ants and beetles, digging for them with their...www.allaboutbirds.org