[flerdle] No, m'dear, although the world did seem to move yesterday when I was nowhere near the kitchen table! I think though that it was but the garbage truck doing its rounds. ;)
Over any given year where I live there must be thousands of birds fly over, take up temporary digs whilst migrating or live within a territory they have staked out in which my humble plot of land exists. Why do dead birds not litter my land and the local parks? Cockatoos are blessed with long lives whilst the smaller birds such as finches and wrens are supposed to be relatively short lived (they were when I used to breed them.) Over the last ten years I have seen two (2) deceased avians. One was a parrot in the local park and the other a juvenile butcher bird which I witnessed being attacked by other local birds. Why is it so? Are there places scattered around the world where birds go to die? Is there an ornithologist in the house?
A couple of thoughts from an ameteur birder (but not an ornithologist, still less a twitcher). The ones flying over are pretty healthy, as are the ones you see staking out territories. Ill and infirm birds will tend to hide where predators can't see them, such as in thick undergrowth. Also dead birds don't tend to last long. Generally predator birds and rodents dispose of them quickly. They also decompose very quickly, bones and all, as the bones are mostly pretty fragile. Having said that, I reckon to find 3 or 4 dead birds a year in my ordinary suburban garden, and that doesn't count the drifts of feathers left when our local sparrowhawk has caught another little bird too intent on one of our feeders to keep a proper look out.