PART TWO
Previous page: A ghostly shoal of bigfin reef squid (Sepioteuthis lessoniana) charges through tropical waters off Sulawesi, Indonesia. By controlling the chromatophores that cover its body, this species can almost instantly change its skin pattern and coloration. Skin cells known as iridophores, mainly on its head, produce iridescent metallic greens and reds when illuminated, while other cells such as leucophores reflect ambient light and are used for passive camouflage. In white light, this squid becomes all white; in green light, it becomes green, and so on. While its camouflage is effective for most predators, the bigfin reef squid is fished and eaten in large quantities throughout Southeast Asia.