Bowerbirds are the artists of the bird world, and they are very much worth looking into.
The males build elaborate artistic constructions, trying to outdo one another, they have to be 'just right'.
They are VERY picky..
They do this to attract a mate and have sex.
Check them out, its just amazing how elaborate their bowers can be. Some bowerbirds are native to Australia.
Also, corvids, the crow family, are very very smart, as birds go.
There was an interesting story on the BBC a while back of a young girl who had befriended crows in her Seattle suburb and the crows would bring her gifts.
(interestingly colored objects) And she would feed them. They clearly were enamored of her.
They also found and returned her mothers camera lens cap to her when she lost it several blocks away.
Other people have also become friends with crows.