The octopus is a mollusc belonging to the class of cephalopoda.
It's arms can grow to a whopping 1m in length and its mantle as long as 25cm.
It prefers shallow rocky bottoms or coastal coral reef in depths above 200m. Octopi will find themselves a shelter where they can minimize exposure and stay safe but will come out, mostly at night, to hunt. They usually move by crawling along the sea floor where it can protect its belly. They are also known to swim using a type of jet mechanism found in its mantle cavity.
- Its favourite food are crabs and molluscs, although it will generally eat whatever it can catch. Using its beak, it is able to break the shell of any armoured morsel.
- It can change colour to camouflage or to mirror its state of mind and mood. It has also been observed changing colour while sleeping which suggests that it is possibly capable of dreaming.
- It uses gills as its respiratory system. It has 3 hearts : 1 main heart and 2 small ones that are each located next to a set of gills. It sends oxygenated blood from the gills to the main heart, which send blood to the body. Deoxygenated blood goes from the body back to the small branchial hearts which pump the blood across the gills to oxygenate it and then back to the main heart to begin a new cycle.
Mating can be very dangerous for the male. A female doesn't often refuse a male's advances but it is not uncommon for the female to change her mind and eat the male. To address this problem, males have a specially adapted mating arm that can deliver sperm into the female's mantle cavity from a safe distance.
The female will lay between 100 000 to 500 000 eggs which she will very rarely leave unattended for her 4-5 month brooding. She will even stop eating to take care of them and will die shortly after they hatch.
A VERY SMART ANIMAL
The Common reef octopus can be found in Mergui Archipelago between other cephalopods and reef creatures. Diving in Myanmar offers a large marine biodiversity, a paradise for all divers !