Love your art as always, I think this is my favourite Wyvern so far! <3 I especially love the colouring and the crest!
Quick note on the phrasing again (Please don't think I'm super fussy, I'm honestly just trying to help); "A very shy dragon that is rather heard that seen" could be rephrased to "A very shy dragon that is more commonly heard than seen." Though the previous sentence is correct grammar wise; it's doesn't flow and the phrasing is slightly out!
Sorry again to be a bother, I really admire your work and I want all aspects of the piece to reflect the brilliance of the designs
If they are nocturnal they wouldn't have any visual dimorphism for mating. Can't see colors in the dark! XD Think of any nocturnal creatures they aren't brightly colored, the most they have is white or black to make patterns like racoons and skunks or panthers and other nocturnal wild cats. They may still have dimorphism but it just wouldn't likely be visual. Sight usually isn't that important to purely nocturnal animals. Love the design other wise I'm always looking for when you post these!!
If it lives on earth then its eyes are photosensitive. All organisms eyes are photosensitive, even if they can also see, to some degree, the infrared or ultraviolet spectrum, they see primarily in the visible light spectrum.
Bats do not see in color. Though they do have very good night vision. If you are implying how they use echolocation to "see" then any visual dimorphism would possibly be some physical difference, a different texture or appendage, something they could detect with echolocation. However it would not be colored because color can not be detected with sound, and any good night vision isn't in color. That is why there isn't a species of bat are brightly colored. The flying fox has some red in its fur, but it flies frequently during the day. I don't know why you felt the need to reply to this when you clearly don't know what you are talking about.
chill i was just emphasizing the lack of specifics given by you and by the author, and looking back i did not read your comment properly, sorry, i thought it said that all organisms are photosensitive..Additionally the artist does not say whether the crest is coloured or not, it could indeed be bright white, reflective or even light emmiting.. specifics eh? also is it possible for animals to mate in the day time if they are nocturnal? humans kind of do it (the other way round)
After seeing a few of these I'm starting to detect a pattern. With most of these they usually carry a colourful aspiration in relation to a butterfly, colourful yes and inspirational yes. Though one could say that the bright colours would give off their locations exposing them to those who would prey on them, but in consideration what would hunt them? nothing considering their capability. Either way moving on.