I should have added a note about behavior--especially the tail wagging of the two waterthrushes.

When teaching beginning birding, I find that people can relate to the following:

Louisiana Waterthrushes move their tails slowly to medium speed, from side to side--like a Cajun waltz.

Northern Waterthrushes move their tails more rapidly, more up and down--like a Yankee Clipper at sea.

Edge Wade
Columbia, MO
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On Apr 4, 2010, at 1:53 PM, Edge wrote:

It also pumped it's tail very vigorously and consistently.  Does one happen to exhibit that behavior more than another?

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