Emperor nautilus (Nautilus pompilius), The shell is countershaded to avoid predation: it blends with background when seen either from above or below.

---

Emperor nautilus (Nautilus pompilius), The shell is countershaded to avoid predation: it blends with background when seen either from above or below. Coral Sea, Australia

---

Size: 3872px × 2592px
Photo credit: © Mark Spencer/AUSCAPE / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: auscape, australian, barrier, cephalopod, cephalopoda, chambered, countershaded, defence, eats, eyes, fauna, fossil, great, indo-pacific, invertebrate, life, living, marine, mark, month, nacre, nautilida, nautilidae, nautilus, nocturnal, numerous, pearly, primitive, reef, repertus, sea, shell, spencer, strategy, suckers, tentacles, underwater, wildlife