The cockatoo is a symbol of change, and light and the end of a tunnel. Communication is a gift of the cockatoo - making oneself understood, understanding the communication of others, and being heard. You should hear the loud cry of the cockie!
Joy, friendship, community, communication, and the ability to survive the harshest conditions is the medicine of the cockatoo.
[Source: http://underthewaningmoon.tumblr.com/post/40510296216/symbolism-of-the-cockatoo]