"Birds of a Feather" is a song by American singer-songwriter Billie Eilish from her third studio album, Hit Me Hard and Soft (2024). It was released as the album's second single on July 2, 2024, through Darkroom and Interscope Records. Eilish wrote the song with her brother Finneas O'Connell, who recorded and produced it at his home studio in Los Angeles. A new wave and pop song, "Birds of a Feather" explores themes of deep love and a desire for lasting connection. "Birds of a Feather" topped the Billboard Global 200 and the national charts of eight countries, including Australia, Croatia, Estonia, Iceland, Lithuania, Malaysia, New Zealand, and Singapore. The song additionally peaked at number two in nine other countries. It has been certified Diamond in France and multi-platinum in Australia, Canada, Greece, New Zealand, Poland, Portugal, the UK, and the US. "Birds of a Feather" was nominated for Song of the Year, Record of the Year, and Best Pop Solo Performance at the 67th Annual Grammy Awards in 2025.