The relevant quote:
A.D. 671. This year happened that great destruction among the fowls.
This is such a bizarre thing to encounter among the endless lists of who became king and defeated whom in battle, or who was baptized when by which bishop, that I feel like there must be something interesting behind it, but there isn't any detail given except that one bare sentence. After all this time I suppose it's highly unlikely that any other record of the Fowl Destruction Incident Of 671 exists, but a girl can always hope.
Interesting. Roger of Wendover wrote the Flores Historiaurm which is a collection of interesting events he got while reading the work of other historians. He has this to say:
In the year of grace 671, there was an extraordinary battle in England among the birds, insomuch that many thousands were found killed, and it seemed that the foreign birds were put to flight.”
I wonder why he calls it a battle?
Thw writings of the historian Æthelweard also mention this:
After the lapse of one year (671) a great mortality of birds occurred, so that on sea and on land a very foul stench was noticeable from the small birds and larger ones