The Cuckoo Wrasse (Labrus mixtus) is a protogynous hermaphrodite, and females can change sex into males, a process which takes around seven months. In this short and interesting video you can observe the phase in which a female has just begun the transformation to become a male: in fact the electric blue color and the darker bands are starting to become evident, but have not yet covered the body as in the phase of complete transformation. The cuckoo wrasse is a species of wrasse native to the eastern Atlantic Ocean from Norway to Senegal, including the Azores and Madeira. It is also found in the Mediterranean Sea.