Check out this article in The Conversation (17 May 2024): The joy of birdwatching: research shows it can improve mental health and foster a sense of wellbeing.
It describes a study which suggests that birdwatching offers even more benefits than just listening to birdsong and is more effective at increasing wellbeing and reducing stress than going on a nature walk.
The reasons for this are linked to biophilia, biodiversity and positive psychology.