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Double-click on
the image to the right to view QuickTime movie of a
Dolomedes rowing across the water
surface. Note that both
the spider and its shadow are shown. The shadow is
informative because it reveals both what parts of
the spider are resting on the water surface (leg
tips and body) and how dimple depth changes during
the rowing stroke (dimple depth is linearly related
to shadow area). |
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