Looks like an old bird.  It's very tame, or perhaps fearless.  Probably the latter.  Think he could do with a bath.  We've seen them drink from our swimming pool but unlike the kookaburras, they never go for a swim. 
Sulphur Crested Cockatoo
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This photo was taken by my husband late this afternoon in our backyard in Sydney, Australia.  August 29, 2003.  
Looks like an old bird.  It's very tame, or perhaps fearless.  Probably the latter.  Think he could do with a bath.  We've seen them drink from our swimming pool but unlike the kookaburras, they never go for a swim. 
September 23, 2003 - This photo also taken in our backyard.  A different cockatoo from the one pictured above.  Same species, different bird & extremely tame.  Did not move while I fetched the camera and took it to Peter, who was standing really close to him, just stayed there in the tree looking around.
Click image for enlargement.
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Crimson Rosellas
Rainbow Lorikeet
King Parrot
Sea Lion Pup
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King Parrot
We don't encourage cockatoos as they are known to strip all the timber off a house for reasons unknown.  Theories for this behaviour are boredom or that someone has stopped feeding them.