Smartest creatures around in the sea?
There are over 800 species of cephalopod, although new species continue to be described.
Cephalopods are found in all the oceans of Earth. Cephalopods are thought to be unable to live in freshwater due to multiple biochemical constraints, and in their +400 million year existence have never ventured into fully freshwater habitats. Cephalopods occupy most of the depth of the ocean, from the abyssal plain to the sea surface. Their diversity is greatest near the equator and decreases towards the poles.
Cephalopods are widely regarded as the most intelligent of the invertebrates, and have well developed senses and large brains. The nervous system of cephalopods is the most complex of the invertebrates. Cephalopods are escape artists, have been known to climb out of their aquaria, maneuver a distance of the lab floor, enter another aquarium to feed on the crabs, and return to their own aquarium.
They are also social creatures; when isolated from their own kind, they will sometimes shoal with fish. Cephalopods have advanced vision, can detect gravity with statocysts, and have a variety of chemical sense organs. Octopuses use their arms to explore their environment and can use them for depth perception. (Wikipedia)
This little cuttlefish was trying to hide on a sponge branch. It has characteristic black and white markings on the front of the lower arms. Lembeh Strait, North Sulawesi, Indonesia
With flying colours!! Brown and white with red and yellow highlights. They can be quite colorful when excited, but usually display muted tones. Adults seldom if ever swim, instead use paired flaps on lower body and lower pair of arms to walk about. Young show more vibrant colours. They are day active on sand bottoms in depth from 3 to 80 m. They are usually easy to approach. Found in Anilao, South Luzon, Philippines
Stretching... Amphioctopus marginatus, also known as the coconut octopus and veined octopus, is a medium-sized cephalopod belonging to the genus Amphioctopus. It is found in tropical waters of the western Pacific Ocean. It commonly preys upon shrimp, crabs, and clams, and displays unusual behavior including bipedal walking and tool use (gathering coconut shells and seashells and using these for shelter) Found in Anilao, South Luzon, Philippines.
The greater blue-ringed octopus is despite its vernacular name a small octopus whose size does not exceed 10 centimeters, arms included, for an average weight of 80 grams. The blue rings are an adornment whose purpose is to clearly show to all potential predators that this octopus is highly poisonous. Found in Anilao, South Luzon, Philippines.
Also known as the coconut, is a medium-sized cephalopod. It is found in tropical waters of the western Pacific Ocean. It commonly preys upon shrimp, crabs, and clams, and displays unusual behavior including bipedal walking and tool use (gathering coconut shells and seashells and using these for shelter). Lembeh Strait, North Sulawesi, Indonesia
The blue-ringed octopus is a small animal (50mm body and arms), which can inject a toxin that produces a respiratory arrest within minutes. Lembeh Strait, North Sulawesi, Indonesia.
No clue why it chose the color red if it wanted to hide, because I spotted it from a mile away in the green bush he was hanging under. It appears they turn red during mating season to attract attention. Sabang, Puerto Galera, Mindoro Oriental, Philippines.
The humming-bird bobtail squid is a small sized sepia. Background color of the body is translucent with a large number of tiny dark chromatophores. External color of the sepia, as we see it, is like a blend of small dark, electric blue and green dots. Widespread throughout the tropical waters of the central Indo-Pacific area from the Indonesia to the Philippines. To hunt its prey at night, it uses a bioluminescent organ located in the gill cavity. Anilao, South Luzon, Philippines.
Flamboyant cuttlefish is brown and white with red and yellow highlights. They can be quite colourful when excited, but usually display muted tones. Adults seldom if ever swim, instead use paired flaps on lower body and lower pair of arms to walk about. Young show more vibrant colours. They are day active on sand bottoms in depth from 3 to 80 m. They are usually easy to approach.Anilao, South Luzon, Philippines.
W. photogenicus is often confused with the similarly colored mimic octopus, Thaumoctopus mimicus.. Wunderpus photogenicus has well-defined white spots on the mantle, and bars on the arms. They lack a white border at the base of the suckers. These are some of the traits that distinguish it from T. mimicus, which has poorly defined dark and white markings on the mantle, and a bright white line along the base of the suckers. The white spots of Wunderpus are unique among individuals, allowing for the use of photo identification to monitor individuals in the wild. Lembeh Strait, North Sulawesi, Indonesia
The blue-ringed octopuses are three (or perhaps four) octopus species that live in tide pools and coral reefs in the Pacific and Indian Oceans, from Japan to Australia. Their primary habitat is around southern New South Wales, South Australia, and northern Western Australia. They are recognized as one of the world's most venomous marine animals. Despite their small size, 12 to 20 cm (5 to 8 in), and relatively docile nature, they are dangerous to humans if provoked and handled, because their venom contains tetrodotoxin, a neurotoxin powerful enough to kill humans. They hunt small crabs, hermit crabs, shrimp, and other small crustaceans. Lembeh Strait, North Sulawesi, Indonesia
Adults of the coconut octopi generally protect their bodies inside bivalve shells when buried or partially buried, or when available, take refuge inside harvested halves of coconut shells. Small individuals find shelter inside gastropod shells and litter such as beer bottles. Also commonly known as veined octopus. Inhabit sandy inshore lagoons and bays. Lembeh Strait, North Sulawesi, Indonesia.
Hairy octopi are very rare to find. They are very small and resemble a fluff of seaweed. They are active during the day. Lembeh Strait, North Sulawesi, Indonesia