Bullock's Orioles are vibrant and charismatic summer residents in Oregon, particularly in riparian areas and open woodlands. They exhibit strong sexual dimorphism, making it relatively easy to tell the males and females apart.

Male Bullock's Oriole (Breeding Plumage):
The male Bullock's Oriole is truly a showstopper with its fiery colors:

Head, Nape, and Underparts: Brilliant flame-orange to deep yellow-orange. This vibrant color covers most of their head, the back of their neck (nape), and all their underparts, including the belly and flanks.
Face Mask: A distinctive black line through the eye (lores and post-ocular stripe) extends back onto the ear coverts.
Throat: A prominent black throat patch or bib.
Back: A solid black back.
Wings: Mostly black with a large, clean white wing patch formed by the primary coverts. They also have a white wing bar formed by the tips of the greater coverts.
Tail: The central tail feathers are black, but the outer tail feathers often show a good amount of orange at the base, contrasting with the black tips.
Bill: A long, pointed, and slender bill, usually dark.

Female Bullock's Oriole (Breeding Plumage):
While not as intensely colored as the male, the female Bullock's Oriole is still a beautiful bird:

Overall Coloration: Generally much duller and paler than the male. Their plumage is a soft yellowish-orange to grayish-yellow.
Head and Neck: The head is typically dull yellowish to grayish-olive, often with a slightly darker line through the eye, though not as prominent as the male's black mask.
Throat: Usually pale yellowish or grayish, lacking the distinct black bib of the male. Some older females might show a hint of dusky on the throat.
Back: The back is grayish-olive to dull brown, often streaked lightly.
Underparts: The breast and belly are a pale yellow to yellowish-orange, less vibrant than the male's.
Wings: The wings are grayish-brown with two clear white wing bars. The large white patch of the male is absent, replaced by these thinner bars.
Tail: The tail is typically yellowish-olive to grayish, sometimes with a hint of orange, but without the strong orange contrast seen in the male's outer tail feathers.
Bill: Similar to the male, long, pointed, and slender.

Immature Male Bullock's Oriole:
First-year males can look somewhat like females but often have a developing black throat patch or dusky smudging on the throat, which is a key indicator they are males. Their orange coloration may also be a bit brighter than an adult female's, but still not as intense as a mature male.

Habitat in Oregon:
In Oregon, Bullock's Orioles are primarily found during the breeding season (late spring to late summer). They are most common in:
Riparian woodlands: Especially along rivers and streams with mature, widely spaced deciduous trees like cottonwoods, willows, maples, and oaks.
Open woodlands and forest edges: Including areas with scattered trees.
Farmsteads and orchards: Where suitable trees are present.
Urban and suburban parks: If large deciduous trees are available.

They are active foragers, gleaning insects from foliage and often visiting flowers for nectar or even backyard feeders for fruit (like orange halves) or jelly. Their complex, whistling, and often chattering song is a characteristic sound of Oregon's summer riparian areas.