Calopteryx

Calopteryx_splendens_male  Calopteryx 

Banded demoiselle (C. splendens) and Beautiful demoiselle (C. virgo) males are flying above slow running water. The males are colored blue. Males may defend a territory above the stream. Males will use their colored wings for signalling and  communication.

signalling with the wings

 

Calopteryx splendens (female) prey capture

Calopteryx prey capture

 

Calopteryx splendens high density of males.

When  many males are present  the males do not defend a territory but instead follow each female.

Calopteryx many males

 
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