Blackwing and his sense of sight.

[Ginasius]

I don't think this is going to have any "Chekhov's gun" type narrative significance but I'm curious about how colors are perceived by animals, familiars, humans and other races in the OOTSverse and, by extension, in D&D.

Is there any reference in the strips to color blindness?

Is there any canonical description in any D&D rulebook about the sense of sight in birds or dogs or elves?

Are there any other tidbits of information on these topics that you remember and think might be interesting?

Of course, this question came to my mind when I saw Roy and Blackwing arguing in the present strip about the yellowness of a ground that I, for one, perceive as "dirty greenish."