David presents two animal types who cope with deep dark fabulously, in different ways and surroundings. First the owls, whose eyes, skull and even spine are anatomically adapted spectacularly to allow incredible eyesight, even at night, yet depends no less on his fine hearing. Next the deep sea squids, a giant with the present fauna's larger eyes, who must use bio-luminescence in the pitch dark at about 1000 meters depth.
—KGF Vissers