Mycteroperca moving in its dark world of green waters is as fine an illustration of the constructive genius of nature, which is not beatific, as any which the mind of man may discover. Its great superiority lies in an almost unbelievable power of simulation, which relates solely to the pigmentation of its skin. In electrical mechanics we pride ourselves on our ability to make over one brilliant scene into another in the twinkling of an eye, and flash before the gaze of an onlooker picture after picture, which appear and disappear as we look. The directive control of Mycteroperca over its appearance is much more significant. You cannot look at it long without feeling that you are witnessing something spectral and unnatural, so brilliant is its power to deceive. From being black it can become instantly white; from being an earth-colored brown it can fade into a delightful water-colored green. Its markings change as the clouds of the sky. One marvels at the variety and subtlety of its power.
Lying at the bottom of a bay, it can simulate the mud by which it is surrounded. Hidden in the folds of glorious leaves, it is of the same markings. Lurking in a flaw of light, it is like the light itself shining dimly in water. Its power to elude or strike unseen is of the greatest.
What would you say was the intention of the overruling, intelligent, constructive force which gives to Mycteroperca this ability? To fit it to be truthful? To permit it to present an unvarying appearance which all honest life-seeking fish may know? Or would you say that subtlety, chicanery, trickery, were here at work? An implement of illusion one might readily suspect it to be, a living lie, a creature whose business it is to appear what it is not, to simulate that with which it has nothing in common, to get its living by great subtlety, the power of its enemies to forefend against which is little. The indictment is fair.