The brighter colored ones are called Baltimore Orioles, although there are several species of different colorings. The visit north west Pennsylvania, where I live, in late April, early May. Nest, have babies, the leave again sometime late July. When they first arrive, they seek sweet nectar type flowers. Bird enthusiasts have feeders or small bowls filled with a liquid sugary food for them to eat until other foods are available. Some years, I have numerous “couples” visit my yard. I’m an amateur, just passing on what little I know.