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Re: vampire ptero toe
Silvio Renesto wrote:
Chris suggested that its life style might be compared to that of nightjars
and other big mouthed birds who chase insects on wing, in dim light or even
during night. Maybe not a vampire, but nocturnal however... ;-)
A wider mouth or beak tends to be associated with aerial hawking for both
birds and bats. I know there have been morphometric studies in bats on this
very topic. A broader beak also occurs in birds that catch insects on the
wing, irrespective of whether the bird is diurnal or nocturnal.
Catching aerial insects is not an easy thing to do. Many members of the
Caprimulgiformes (mostly nocturnal or crepuscular) have rictal bristles
around the mouth, which serve as insect-detection devices, as well as a sort
of insect net (or funnel). I believe certain insect-catching passerines
have rictal bristles, such as flycatchers (Tyrannidae) and the redstart
All this undercuts the hypothesis that the ancestors of birds developed
wings in order to catch aerial insects. Non-avian theropods have narrow
snouts (with the possible exception of _Epidendrosaurus_/_Scansoriopteryx_,
which is described as having a wide mouth). Insect-catching theropods would
presumably have to compete with insect-catching pterosaurs, which had a
headstart on them of about 70 million years.
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