Blue-ringed octopus - There are four species of this highly-venomous octopus, and although relatively docile, when agitated they flash their impressive blue rings to warn predators of their bite.
Humphead wrasse - Also known as Māori wrasse and Napoleon fish, these blue fish are known for their intricate blue-green patterns and the hump on their head. They are mainly found on coral reefs in the Indo-Pacific region.