I have had Orioles for four years now swarming my tacky orange feeder. Last year we had 6-- i had to buy a second feeder-- this year I think just four.
They generally arrive May 10 or 11-- this year the were late-- and they are still here. They are jumpy at first, but yeaterday i was gardening 4 feet from the feeder, and my dogs were running all over the place and the birds stayed put. The nectar level has been dropping dramatically .
They only stay abou 3 weeks, max.
Love them