99,5% of species have "normal" coloration which is neutral. Some of them have even conspicuous color that should be explaind away using great darwinistic fancy.
Conspicuous colouration of species does not need to be "explained away", it's perfectly understandable in simple darwinistic terms. Flowers have conspicuous colours because insects pollinate them, and flowers that attract more insects by being more brightly coloured will prosper more than those less so. Some very brightly coloured insects are signalling their being poisonous to would-be predators. The better the warning, the better the chance of survival. Some birds are brightly coloured because it has become a factor in their mating process. The more beautifully coloured the bird, the better its chances of being chosen as a mate. The latter is a case of darwinism involving sexual selection.
No "great darwinistic fancy" needed, just the same old story, time and again, of random mutation and natural - or sexual - selection.
"Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science." - Charles Darwin.