Black with pale fins, an underslung jaw and a luminescent belly, the pygmy shark measures less than 30cm when fully grown and is harmless to humans. An open-ocean dweller, it spends its daylight hours in deep water (to depths of 1520m) and migrates after sunset to the surface in pursuit of bony fish, cephalopods and crustaceans. In Australian waters, it’s found in tropical and warm-temperate seas from Perth to Rowley Shoals, west of Broome, WA.