"Bird" was the first single to be released as a six-member group afterXiumin andD.O. enlisted for theirmandatory military service.[1][2] The song was first released digitally on October 10, before it was released physically on November 4, commemorating theirfourth anniversary since debuting in Japan. With a mid-tempo arrangement, the lyrics convey the members feeling with their fanbase.[3][4]
"Bird" was re-released as an octet on April 15, 2023, with the song now featuring the vocals of all eight members, including Xiumin and D.O. who were absent from the original version.[6] Exo performed the new version at EXO Channel: The Best fan meeting event in Japan.[7]
^"EXO、5度目のワールドツアー日本公演。横アリで「僕たちも会いたかったです！」" [EXO performs in Japan for the fifth time on its world tour. "We wanted to meet you too!"].BARKS (in Japanese). Japan Music Network. October 24, 2019.Archived from the original on March 15, 2024. RetrievedMarch 15, 2024.
