In the home i shared with my ex we had a lovely back garden. It had an apple tree and a pear tree that had intertwined ( i dont mean interbred. Just wrapped around each other). Got lovely fruit from both but always left some on the tree for the birds to pick at.
As jen said, always put fresh seed and nuts out for the wild birds , hung from the branches so the mogs couldnt get to them.
Also had a buda leia ( not sure if thats right) bush ( butter fly bush) got thousand of butterflys in the summer.
Loved seeing the robins in the winter too .
Was a lovely garden . I love gardens.