The Pyjama Squid (Sepioteuthis lineolata), also known as the Striped Pyjama Squid or the Lined Dumpling Squid is usually hiding in the sand with its head protruding waiting to ambush its prey. When spotted out and about they usually quickly run for cover and hide again once they spot you!
This type of cuttlefish, misleadingly named a squid, belongs to the family Sepiadariidae. This type of cuttlefish is endemic to Australia and is one of the few species that has a poisonous sting - which is why scientists believe they have the vivid stripes, in an effort to ward off predators.
They are small (around 10cm in length) and very cute.