Only 1 explanation possible...some strain of fast spreading BIRD FLU! Either a virus or fungus is infecting the birds.
Most of the past cases of this have been some sort of bird flu. Of course until recent years we didn't hear about them (no Internet hysteria factor until recently).
From the mega oil spill.
The bridge was TOOOOOOOOOO far...
Perhaps the Hall of Souls is almost empty... The Guf.