Bing Crosby

When a bird young and free
Hangs around a certain tree
Singing serenades that tell his love is true
That's because it's the natural thing to do
And when a cat on a fence
Keeps his darling in suspense
And he's brave enough to face a well-aimed shoe
That's because it's the natural thing to do
And you know every dove
Has its heart set on love
Rabbits too, pet and pat
And there's nothin' wrong with that
When a boy such as I
Tries so hard to qualify
With a very lovely lady such as you
Can't you see it's the natural thing to do?
And then the girl she acts demure
The boy he feels proud and sure
So proud and sure that
He impulsively suggests a rendezvous fine thing
That's because it's the natural thing to do
But the girl she just won't agree
She whimpers and she simpers
And he begs on bended knee
But she runs away because she knows full well
He'll pursue the chump
That's because it's the natural thing to do
Then the boy in despair
Waves his arms, tears his hair
Stamps his feet and he acts like mad
Then you know that he's got it bad
Then the girl she oughta fall
If she's got a heart at all
She should take him in her arms
And kiss him too
Oh, oh, just the natural thing to do