These two different species have an interesting history that includes, for a 12-year period, being lumped together into one species uninterestingly called "Northern Oriole". The Bullock's Oriole (on the left) is a western species that somehow found it's way to Dad's oriole circus feeder in Moncks Corner. Baltimore Orioles (on the right) usually leave the US entirely during winter months but more and more are overstaying the winter in the continental US because of feeding stations.

Dad has even allowed the DNR to come out and band Orioles at his place. For years I've watched his flocks hoping for a Bullock's and, finally, one showed up, and an adult male at that.

The trees and the feeder make it look like a composite but it's just one photo.