Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) portrait, captive. Kona, Hawaii. Central Pacific Ocean.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) portrait, captive. Kona, Hawaii. Central Pacific Ocean. Digitally manipulated image.

Jeff Rotman / Newly hatched Spined pygmy shark still attached to egg sac (Squalilus laticaudatus) Mediterranean

Doug Perrine / Close-up of the skin of a bioluminescing Pygmy shark, (Euprotomicrus bispinatus) showing glowing blue photophores (light organs). Captive. Kona, Hawaii, Central Pacific.

Doug Perrine / Bioluminescing Pygmy shark, (Euprotomicrus bispinatus) showing glowing blue photophores (light organs). Captive. Kona, Hawaii, Central Pacific.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) captive, bioluminescing. Captive, Kona, Hawaii, Central Pacific Ocean.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) showing head with teeth, eyes, and nares or nostrils. Captive, Kona, Hawaii, USA. Central Pacific Ocean.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) held in human hand, Kona, Hawaii. Central Pacific.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay, South Africa, September.

Jeff Rotman / Newborn Spiny Pygmy Shark (Squaliolus laticaudus) with yolk sac still attached held in hand, Israel, Mediterranean Sea.

Jeff Rotman / Spined Pygmy Shark (Squaliolus laticaudus) portrait - One of the smallest sharks. Israel, Mediterranean Sea.

Norbert Wu / Pygmy Shark (Euprotomicrus bispinatus) small size, maximum 12 inches