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On Mon, 22 Apr 1996, Darren Naish wrote:

> Bats probably took to nocturnality because of predation from diurnal birds of
> prey which, back in the Eocene, included early hawks and falcons as well as
> predatory rollers. Modern islands devoid of birds have day-flying bats.

        Well, there are the flying foxes...
        Although this might explain why bats have thrived in the face of
bird competition, unlike what appears to happen in the late Cretaceous
with pterosaurs. Pterosaurs probably competed more with the birds for
niches than modern, nocturnal bats do, since they were probably diurnal
as a group.