Why Don't Birds Freeze To Death? I'm In A Freaking Parka With Three Layers Of Thermals Underneath And I'm Still Freezing

Listening to the birds chirping in the Peaceful, wintery, Instrumental Music videos; makes me wonder what the birds are saying; It's freezing, snowing and there's no food so I'm guessing they're begging for a speedy death or asking God "Why me Lord"! But it sounds so p r e t t y though