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Below are images of friendly octopuses seen during our exploration missions that have been featured through our Facebook and Twitter accounts as part of "Octopus Friday." Click on an image to enlarge it. Enjoy!

Click through for pictures of these stealthy animals, which can be found in wide-ranging habitats from the deep sea to coral reefs, such as the above octopus seen in the Bonin Islands near Japan in 2008.

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A young octopus off of Pramuka Island (map) near Jakarta, Indonesia, hatches from among a collection of eggs. Some octopus species lay their eggs on rocks or other areas of the seafloor, but others will hang on to their eggs, or brood them.

Rambo, a female octopus at Kelly Tarlton's Sea Life Aquarium in Auckland, has been trained to use a $300 Sony Cyber-shot TX30 waterproof digital camera to take photos of tourists. The aquarium charges just $2 in local currency (about $1.88 Canadian) for the service. The money goes toward aquarium operations and programs.

In 2019, the research team had another dive planned to revisit the octopus garden, equipped with long-term temperature loggers, oxygen loggers, and water samplers. They instead discovered the unexpected: a whale fall.

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Spotting a squid or octopus is always an exciting experience, but capturing an amazing photo of these critters can be a challenge. Luckily, the amazing underwater photographers from our 2014 Through Your Lens photo competition nabbed some top-notch shots.

The whole point of exploration is to find something never before discovered. This is an undescribed octopus photographed at night in the middle of the ocean. Unnamed creatures abound here, following the darkness to the surface at nightfall to feed, only to descend back into the depths by morning.

Blue-ring octopuses are some of the world's most venomous marine animals, and they can be recognized by their blue and black rings. They are typically 5 to 8 inches in length, but their venom is powerful enough to kill humans. No antivenom is available, which makes these creatures among the deadliest in the ocean.

After laying her eggs, the female octopus cares for her babies until they hatch. She sits guard and forgoes food the entire time, which ranges from weeks to several months. She blows currents across her eggs to keep them clean and protects them from predators. As her babies grow safely within the eggs, she becomes more and more weak. The great mother dies after her eggs hatch.

Portlock is known for its wild ocean energy. The surf zone there can be as punishing as it is beautiful. The rewards for braving such conditions, though, are many. This day octopus takes refuge in the nearshore surge to bask in the shallow sunlight among the hard coral reef.

I was focused on a scorpionfish when out of the corner of my eye I saw something move. This octopus was hoping to avoid my strobes, but I was able to interact with him for 10 minutes before he found a new den.

A diver in Washington has captured stunning photos of a massive, alien-looking octopus in shallow water along the state's coastline. The rarely seen cephalopod, which spends most of its life in the deep sea, had injuries that suggest it may have been recently attacked by a cookiecutter shark.

Underwater photographer Eric Askilsrud, who is based in Washington, snapped the pictures on Sept. 8 while diving at Tongue Point in the Salish Sea, near the Canadian border. Askilsrud encountered the octopus in 10-foot-deep (3 meters) water while exploring a kelp canopy. The unusual-looking cephalopod was around 3 feet (0.9 m) long.

"It was floating motionless with its tentacles down," Askilsrud told Live Science. At first, Askilsrud thought it was a kelp tangle, but he soon realized he was looking at a "very bizarre-looking" octopus.

Askrilsrud had no idea what species the octopus belonged to, so he sent his photos to Gregory Jensen, a marine biologist at the University of Washington, who identified the creature as a seven-arm octopus (Haliphron atlanticus).

Severn-arm octopuses usually live in deep waters far from shore, according to the Monterey Bay Aquarium Research Institute (MBARI). As a result, most of what we know about the species comes from remotely operated vehicle (ROV) footage, or when specimens wash ashore, like one found in Puget Sound, Washington in 2020.

In 2017, an ROV operated by MBARI filmed a seven-arm octopus feeding on an egg-yolk jellyfish (Phacellophora camtschatica), suggesting that the species mainly feeds on slow-moving jellyfish, rather than hunting fish or crustaceans.

It is unclear which predators may target seven-arm octopuses. But strange round marks on the recently photographed individual may have been inflicted by a cookiecutter shark (Isistius brasiliensis), a small shark that is known to bite eerily circular chunks of flesh from a range of different marine animals.

The Pacific Northwest tree octopus (Octopus paxarbolis) can be found in the temperate rainforests of the Olympic Peninsula on the west coast of North America. Their habitat lies on the Eastern side of the Olympic mountain range, adjacent to Hood Canal. These solitary cephalopods reach an average size (measured from arm-tip to mantle-tip,) of 30-33 cm. Unlike most other cephalopods, tree octopuses are amphibious, spending only their early life and the period of their mating season in their ancestral aquatic environment. Because of the moistness of the rainforests and specialized skin adaptations, they are able to keep from becoming desiccated for prolonged periods of time, but given the chance they would prefer resting in pooled water.

An intelligent and inquisitive being (it has the largest brain-to-body ratio for any mollusk), the tree octopus explores its arboreal world by both touch and sight. Adaptations its ancestors originally evolved in the three dimensional environment of the sea have been put to good use in the spatially complex maze of the coniferous Olympic rainforests. The challenges and richness of this environment (and the intimate way in which it interacts with it,) may account for the tree octopus's advanced behavioral development. (Some evolutionary theorists suppose that "arboreal adaptation" is what laid the groundwork in primates for the evolution of the human mind.)

Reaching out with one of her eight arms, each covered in sensitive suckers, a tree octopus might grab a branch to pull herself along in a form of locomotion called tentaculation; or she might be preparing to strike at an insect or small vertebrate, such as a frog or rodent, or steal an egg from a bird's nest; or she might even be examining some object that caught her fancy, instinctively desiring to manipulate it with her dexterous limbs (really deserving the title "sensory organs" more than mere "limbs",) in order to better know it.

Tree octopuses have eyesight comparable to humans. Besides allowing them to see their prey and environment, it helps them in inter-octopus relations. Although they are not social animals like us, they display to one-another their emotions through their ability to change the color of their skin: red indicates anger, white fear, while they normally maintain a mottled brown tone to blend in with the background.

The reproductive cycle of the tree octopus is still linked to its roots in the waters of the Puget Sound from where it is thought to have originated. Every year, in Spring, tree octopuses leave their homes in the Olympic National Forest and migrate towards the shore and, eventually, their spawning grounds in Hood Canal. There, they congregate (the only real social time in their lives,) and find mates. After the male has deposited his sperm, he returns to the forests, leaving the female to find an aquatic lair in which to attach her strands of egg-clusters. The female will guard and care for her eggs until they hatch, refusing even to eat, and usually dying from her selflessness. The young will spend the first month or so floating through Hood Canal, Admiralty Inlet, and as far as North Puget Sound before eventually moving out of the water and beginning their adult lives. ff782bc1db