Gratefulness is the key to a happy life that we hold in our hands, because if we are not grateful, then no matter how much we have we will not be happy—because we will always want to have something else or something more.
For some birds, songs are learned by listening to their parents and neighbors during
the first year. For other birds, songs are hardwired -- the music is scored in their
brains from the beginning. For mockingbirds, singing is a lifetime of choir practice
and talent shows, picking up new tunes and modifying old ones.
