From JOHN BRUNNER
It has always puzzled me, especially in connection with the disappearance
of the dinosaurs, why reference is so seldom made to disease and/or parasites
(‘Extinction: bad genes or bad luck?’, 14 September). Could not, for example,
the creation of a land bridge by lowered sea level have introduced them
to non-resistant species? (It’s happened often among humans.)
I also wonder about the role of birds . . .
John Brunner South Petherton, Somerset
