[dse1982]

My cousin wrote a book about this topic (it is not only about blue animals but the general scarcity of blue in the natural environment): https://www.amazon.de/Blue-Science-Secrets-Natures-English-e...

I never gave this much thought before but the book quite successfully managed to interest me in its subject and lead to me understanding some of the underlying mechanisms (which lay all outside my domain as a software developer).