>>5021330
>using miniscule birds as an analogue for 10+m long megafauna
Yes, and?

>you picked off reddit
I got it from Google, but more specifically this study: https://www.researchgate.net/publication/330365465_New_sightings_of_melanistic_Green_Herons_Butorides_virescens_in_the_Caribbean_suggest_overlooked_polymorphism

>you would have elephants of every colour of the rainbow
Nice hyperbole, but no.