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Tweeters,

I'm forwarding this response to my earlier posting about dipper
behavior.
--
Mary Rogers
Seattle, WA
mkrogers at wolfenet.com

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Date: Sat, 27 Jun 1998 12:17:18 -0700 (PDT)
From: "R. Donnelly" <roarked at u.washington.edu>
To: mkrogers at wolfenet.com
Subject: dipper behavior
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Hi. I got your email to tweeters through the grapevine. While studying a
dipper population in NE Utah for 4 years and I witnessed dippers beating
prey against rocks and shaking them quite often. They seem to do this for
longer periods of time and more violently with fish, sometimes with larger
insects (e.g. caddisflies and stoneflies), and never with smaller insects.
My impression has always been that they do it to subdue their prey. Since
they do it with fish before swallowing them whole, it does not appear to
be a behavior limited to the provisioning of nestlings.

I'm sure you got many other replies. Hope this is interesting. Aren't
dippers amazing?


+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Roarke Donnelly

College of Forest Resources 206.543.8264 work
Div. of Ecosystem Science and Conservation 206.685.0790 FAX
University of Washington 206.283.6795 home
Box 352100
Seattle, WA 98195-2100
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


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