The last thing I read to explain the bobbing action is that it helps them
see through the reflection on the surface of the water by bobbing up and
down. It is interesting that the Dipper does the same motion along with a
couple of other species which I can't remember at the moment. It may also
improve depth perception.

Jim


At 05:25 PM 12/1/99 +0000, William Rietveld wrote:
>Tweeters -
>We were watching a spotted sandpiper this morning, and started wondering
>what purpose the bobbing body action served. Has anyone seen any theories
>on this?
>

Jim Rosso
Issaquah, Washington
Home - 425-392-8440

mail:jrosso at mediaseek.com