Now you can hear the songs that a small Argentine bird composes while sleeping. Hearing such songs in more species of birds could inform discussions about how birds dream.
physicist Gabriel Mindlin A professor at the University of Buenos Aires in Argentina became interested in the mechanics of bird song in the early 2000s, but expected it to be just a “fun detour.” Instead, it led him down the path of trying to hear what was going on inside the bird’s body…
Source: www.newscientist.com