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'Undulation' (Pipevine Swallowtail)
Pipevine Swallowtail's flutter very quickly as they feed.<br />
And during peak summer months they're especially active. I like the up & down "undulation" of the wings here.

Pipevine Swallowtail's flutter very quickly as they feed.
And during peak summer months they're especially active. I like the up & down "undulation" of the wings here.

Copyright Howard B. Cheek