In Birds of a Feather, Billie Eilish dives into the darker side of love and devotion. Her chilling lines, “If I’m turning blue, please don’t save me,” reveal the lengths she’s willing to go to for her partner. The song intertwines romantic idealism with a sense of self-destruction, as Billie sings of love that consumes, for better or worse. Her words, “Birds of a feather, we should stick together,” serve as both a reassurance and a haunting reminder that love can sometimes blur the line between togetherness and dependency. This track invites listeners to ponder the fine line between loyalty and obsession in love.