Speckled wood butterfly (Pararge aegeria)

Bont Zandoogje 310512 1454 Part small

 Two speckled wood butterfly males may show circling behaviour in which each butterfly is following the other one. An animation (10X retarded) of this behaviour is given here. The butterflies are shown and their shadow.

Bont Zandoogje paar 300413 1359 anim

The orbit of both butterflies referred to their center of mass is given in the animation below. The red line is indicating the position of both butterflies.

Bont Zandoogje paar 300413 1359 300Hz animcirc rotation AB

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