Secret of song lies in birds with 'two' brains.

The article offers insight on an investigation by neuroscientist Erich Jarvis on how forebrain neurons are guided normally to the hindbrain in a songbird. Jarvis team conducted a brain transplants on birds embryo that are two-days old to inquire song learning in the birds. The team observed that some of the finch neurons make a beeline for quail's hindbrain.