Trance Birds

I have no idea what they're called, but I often hear a fascinating bird song when i'm hiking, and called them trance birds because I thought that their song would fit very well into a trance song.

While not incorporated exactly how I would envision it, Susumu Yokota did use the Trance Bird song in his song Zenmai off of Acid Mt. Fuji. You can hear the birds in the first minute of the song, before the beats start.

And if you know the name of the bird, please let me know!