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Re: EARLY BIRD FROM SPAIN
On Thu, 1 Aug 1996, Nick Longrich wrote:
> I can't think of any reason to call bats clumsy fliers, and the fact
> that there are about 1000 species of them or something ridiculous
> like that proves that they're good enough at it to suit Mother
> Nature or natural selection.
But they are almost completely outcompeted in the day time by
alula-bearing birds. Any enhancement of aerial agility in a flying
animal must have a telling selective edge. Although this is
self-evident, I also wonder whether other things such as increased
heaviness due to having to carry offspring within, or fragility of bat's
wings might also affect their day/night distribution?
> Pterosaurs were very diverse, and they didn't have an alula.
...but seem to have become less diverse when things evolved that _did_