Southern Calamari, squid or
Sepioteuthis australis (if you want to get technical) are wonderful to watch at night when they are out hunting.
This juvenile under Edithburgh Jetty shows the incredible colouration created by the chromatophores in their skin.
They also remind me of the sentinels in 'The Matrix', affectionately know as the squiddies!
Photo: Robert Rath, 'Squiddy' 1/100s f/20 ISO160 100mm