Can’t worry about it. Reading your unexpectedly hostile reaction to my post necessitated a double dose of brain candy. Everything’s alright now.
Just kidding…I hide it under my tongue and spit it when the nurse ain’t lookin. Sorry again for the left hook.
Not all frozen birdy stories end tragically.
Last december, I was leaving my mum’s place and found a disabled bird in the snow. It couldn’t use its legs at all, and pathetically tried to “fly” away from me as I approached it – skittering a few feet at a time along the surface of the snow.
I picked it up and brought it inside to my mum’s place, and put it in a shoebox with a heated bean-bag to warm it up.
Figured it would probably die – but in a best case scenario imagined it might recover and be released in a day or so. Hah.
When I came back to my mum’s place, the bird had not only recovered, but she had gone out and got a huge cage for it, big enough to accomodate a cockatiel. (It was tiny little finch-like yardbird.) She fed it good seed, bits of apple, strawberry, carrot, and whatever all through the winter, and got pretty attached to it. In the early spring, she’d move the cage out to the balcony in the warm part of the afternoon. When she figured it was warm enough, she started leaving the cage door open. Not only did it recover enough to be released again, it quickly paired up and nested in a tree right by her balcony – close enough to take full advantage of the honey seed sticks that she put out there. (He was by then the fattest, healthiest bird of the bunch – his only flaw being an errant “cowlick” feather on the top of his head.)
Now she’s got a budgie in the cage. 
Well, the whole idea of birds as pets is fairly far outside anything that’s natural. That doesn’t mean there’s anything really wrong with it. But when you find a wild bird dying from natural causes, you’re seeing something that is perfectly normal and indeed extremely common. My conclusion is that there’s thus no reason to be deeply troubled by it.
When you say “very tiny,” how tiny do you mean? The sparrows who visit the feeder I have mounted on the window next to my desk are only two or three inches tip to tail.
I love birds, and whether it’s “just natural” for them to die or not, it saddens me that they do.