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Re: Ears

To: "The Dinosaur Mailing List" <dinosaur@usc.edu>
Subject: Re: Ears
From: "David Marjanovic" <david.marjanovic@gmx.at>
Date: Thu, 4 Apr 2002 22:58:24 +0200
References: <Pine.LNX.4.33.0204041101380.10135-100000@poczta.ibb.waw.pl> <004e01c1dbbb$74216f00$b4432fd5@chello.at> <3CACBC60.F292D668@alphalink.com.au>
Reply-to: david.marjanovic@gmx.at
Sender: owner-dinosaur@usc.edu

----- Original Message -----
From: "Dann Pigdon" <dannj@alphalink.com.au>
Sent: Thursday, April 04, 2002 10:49 PM

> > So while it's ambiguous whether multituberculates and
> > triconodonts had them, we can be pretty certain that no dinosaur ever
did.
>
> Can we be so sure? How many extant archosaurs are there? Aquatic
> varieties (crocs) and aerial forms (birds) both of which have
> aqua/aero-dynamic concerns. Any external ear flaps may have been lost by
> both lineages, for the same reasons that whales or moles lost theirs
> (okay, so bats throw a spanner in the works - but echolocation
> requirements may be a factor there).

Not for fruitbats. And what about Otariidae? -- I won't comment more on
monotremes, but secondary loss in birds is really improbable.

References:
- Ears
  - From: Jerzy Dyczkowski <jerzyd@poczta.ibb.waw.pl>
- Re: Ears
  - From: "David Marjanovic" <david.marjanovic@gmx.at>
- Re: Ears
  - From: Dann Pigdon <dannj@alphalink.com.au>