Male juvenile imago of <i><a href="//commons.wikimedia.org/wiki/Calopteryx_virgo" title="Calopteryx virgo">Calopteryx virgo</a></i>. The metallic blue wing color develops with age.
<a href="//commons.wikimedia.org/wiki/User:MichaD" title="User:MichaD">Michael Apel</a>
CC BY 2.5
photo taken by <a href="//commons.wikimedia.org/wiki/User:MichaD" title="User:MichaD">Michael Apel</a>