Eight-year-old Thomas was born with a rare genetic disorder, which resulted in a lot of trouble communicating with his parents. Now, Thomas undergoes dolphin therapy in the Florida Keys.

Some parents say the chance to swim with dolphins has changed their child's life. Withdrawn autistic children, for instance, have forged bonds that have proved difficult with human playmates.

"Extraordinary Birds" highlights the intimate links that people have forged with birds. In many instances, birds are more than just symbols -- they are companions.