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Re: BATS, BIRDS, PTEROSAURS, ECHOLOCATION & SIGHT



Adam Britton wrote:

<If pterosaurs had echolocation, there must have been some kind
of selective pressure to favour development of a sound-based
system over a visual one, assuming that the immediate ancestors
of pterosaurs had reasonable vision.>

  If pterosaurs had echolocation ... they would have directly
observable osteological or trace (endocast) evidence indicating
this: this includes, but is not limited to, enlarged otic
capsule, distinctive auditory regions of the brain and large
cerebellum, favoring of otic region instead of optic region
(microbats have better ears than eyes, oilbirds marginally so).


=====
Jaime A. Headden

  Aaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhr-gen-ti-na
  Where the Wind Comes Sweeping Down the Pampas!!!!

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