Four weeks and counting down

I was on my way on home, waiting for the train and I saw a bird at the track cleaning itself.
And I wonder...
What is in the purpose of it's life?
Okay, he eats to live. S, he'll search high and low for food. Maybe he lives to mate, so that they don't go extinct. And then?
Come to think of it, life seems quite boring eh?
So, isn't it better off to be a human?
But being a human - it is so difficult.
There's a saying : do you eat to live or do you live to eat?
If we live to eat, then what is our purpose of life?
If we eat to live, then what is our purpose of life as well?
Defining your eating purpose - you can then define your eating lifestyle and that means, how you look like. If you eat to live, then probably you eat enough. But if you live to eat, maybe you are going to be huge.
My life was to live to eat - that's why I'm fat. I hope to amend this error soon.