How do loudly calling birds not deafen themselves?

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How do loudly calling birds not deafen themselves?

from [birder]

To:
Subject:	How do loudly calling birds not deafen themselves?
From:
Date:	Fri, 8 Feb 2008 10:06:13 +1100

On Fri, Feb 08, 2008 at 08:27:52AM +1100, Tania Ireton wrote:
> A friend rang me last night to ask how loudly calling birds such as Rainbow
> Lorikeets and Sulphur-crested Cockatoos not deafen themselves with their
> screeching?

Unlike mammals, birds apparently have the ability to regenerate
the hair cells in their inner ears if they are lost or damaged.
So if they do deafen themselves with their calls, they can regain
at least some of their hearing.

http://www.bsos.umd.edu/psyc/dooling/projects/hair%20cell%20recovery.htm

Perhaps they have loud calls _because_ they are partly deaf?

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