Bullock's Orioles (Icterus bullockii) are the most common oriole I see in my yard here in Tucson. Male Bullock's Orioles are a bright orange and black with a characteristic black throat, black eye-stripe, and a white wing patch.
Female Bullock's Orioles are a duller gray and yellow color, and they are more difficult to identify than the flashy males.
Bullock's Orioles enjoy flower nectar, and one of their favorite flowers are these nectar-filled, orange Silkoak (Grevillea robusta) flowers.
With their fondness for sweet treats, Bullock's Orioles will also happily feed on halved oranges and visit oriole feeders filled with sugar water. Oriole feeders are actually just modified hummingbird feeders with perches.