Birds chirping in the trees told the early men everything was fine.
Back then, silence was usually a sign of trouble. A fear signal for your brain.
Even today. Silence scares the crap out of us. Most people get uncomfortable with any period of silence. You walk up to your colleague's desk. Crack jokes. Pick up the phone and call your friends. Get on twitter. Respond to facebook comments. Your birds are singing and you feel safe.
What you forget however, is that today, silence is often hugely productive.
I am not saying that cracking jokes with colleagues, calling a couple of friends, tweeting or spending time on facebook are a bad thing to do. But if you are doing them just because you are scared of productive silence that surrounds you, then all you are doing is generating noise. For yourself and rest of the world.
You are breaking the silence that was making (or could have made) you productive. There is nothing safe about that. In fact, in the long run, that is exactly what you should be truly afraid of.
True, silence is scary. But if you genuinely want to hear the birds sing in the long run, learn to embrace silence and make the most out of it.