Thank you for your answers, that’s very interesting. It’s usually only a side issue – in general people are interested in behaviour and colouration during courtship display between males and females.
Also you often hear about male aggressive colouration – but don’t find any pictures. It is said to look different from the colouration in courtship display. Ted mentioned it above, too.
How does aggressive colouration in males look like – here it is the same, you mostly find pictures of displaying males in their brightest colours, or of really anxious, pale ones………….