Our Musical Birdbrains: Why Do Birds (And Humans) Sing?

Do Birds Respect Human Musical Scales?

Zebra finches: Scientists teach bird brains to learn a new song

Birdsong — Twenty Thousand Hertz - The stories behind the world's most recognizable and interesting sounds.

Almost Human: Fact or Science Fiction?

Know Your Brain: The Locus Coeruleus — Its Blue Spot

Dr. Daniel Amen on Taking a Closer Look At the Brain

The Singing Life of Birds

How And Why Do Birds Sing? » Science ABC

Bird vocalization, Psychology Wiki