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In honor of International Octopus Day, sneak a peek at these quick-change artists as they hunt, hatch, and feed. Octopuses are masters at flying under the radar, changing their coloration and texture to match their surroundings in seconds.But today, this intelligent invertebrate is in the spotlighta€”it's International Octopus Day.
In addition to being able to take on amazing disguises, octopuses are also accomplished swimmers.
An octopus off Rockport, Massachusetts, feels its way in the deep dark sea using its eight arms. An octopus glides through green water in Fiordland National Park on the southwestern coast of New Zealand. A young octopus off of Pramuka Island (map) near Jakarta, Indonesia, hatches from among a collection of eggs.
An Octopus cyanea in the Tukangbesi Islands, Indonesia, hunts for food among the crevices of a reef. Octopus arms are a marvel of engineering, and suction cups (pictured on an octopus at Australia's Merimbula Aquarium) are a big reason why.Not only can the animals use their suckers to "taste" their environment, they're strong enough to hold more than a hundred times their own weight. A giant Pacific octopus clings to the side of its tank in Baltimore, Maryland.It's the largest octopus speciesa€”the record-holder measured 30 feet (9 meters) across and weighed over 600 pounds (272 kilograms).
Day-old Octopus vulgaris, known as common octopuses, mill about in a tank at the Spanish Institute of Oceanography in Galicia.The institute's goal is to be the first to breed octopuses in captivity. A Pacific giant octopus scavenges the carcass of a spiny dogfish (Squalus acanthias) off the coast of British Columbia, Canada. They may have grown into giants, but tiny fossils reveal the harsh first weeks faced by young titanosaurs. Tim Laman and Cheryl Knott, who have dedicated their lives to studying the great ape, talk about their new show on Nat Geo WILD. A groundbreaking study finds calcified hearts in ancient fish at least 113 million years old, the first whole fossil organs of their kind. Green Beret and Army veteran Ray Knell was a broken man with PTSD and severe anxiety when he returned home from Afghanistan. Army veteran Knell slaps a sign marking the southern border of Yellowstone National Park as he begins the last stretch of his 1,000-mile ride from Lake George, Colorado, to Manhattan, Montana, for the veterans’ group Heroes and Horses."I knew if I could make it through the Winds, I could make it to the end. Violet, aka “Violent” because of the way he attacks the trail, has one ear and eye on the buffalo and the other ear and eye on rider Masters. Knell walks his livestock back to camp along the Lamar River after they ran away during the night. Seemingly striking a blow for ecological balance, a Caribbean reef shark chomps on an invasive lionfish in the clear waters of Roatan Marine Park off the coast of Honduras.

I watched a lionfish trying to sting a tang or triggerfish (can’t remember which one). Many fish are wise to give sea anemones a wide berth, lest they feel their venomous sting, but a mucus layer allows anemonefish to acclimatize themselves to the tentacles’ toxins. This aptly named carpet sea anemone has completely covered underlying coral with a vibrant green shag. An anemone’s colorful “blossom” makes it clear why the animals were named after terrestrial flowers.
The jewel anemone, pictured here, is just one of more than a thousand sea anemone species. Help protect the last healthy, undisturbed places in the ocean so we can learn how to help healthy reefs thrive, help unhealthy reefs recover, and better preserve the ocean. Explore the world's oceans, from their prehistoric beginnings to modern-day efforts to preserve their natural wonder.
Immerse yourself in the wonders of the deep through colorful maps, photos, and satellite images. The National Geographic Society’s freshwater initiative is a multi-year global effort to inspire and empower individuals and communities to conserve freshwater and preserve the extraordinary diversity of life that rivers, lakes, and wetlands sustain. They can travel via jet propulsion, taking water into their mantle cavitya€”the region containing their heada€”and squirt it out of a tube called a siphon. 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.A deep-sea species called Graneledone boreopacifica is the ultimate mother. And I knew if I made it to Yellowstone I had no excuse not to finish," Knell said as he crossed into the park. Working with park officials, local divers are attempting to give sharks a taste for the alien reef species, which are native to the Pacific and Indian Oceans. The lionfish would snap his spiny rays much like stream fishermen (whip the pole back and abruptly forward in a casting motion). So a shark would really have to stuff itself to subsist on them - I imagine they like meatier choices when possible. The maneuver is mutually beneficial: The anemones get a mobile, competition-free surface on which to perch and pick up scraps, and the crabs get an effective camouflage and protection provided by the sea anemone’s toxic tentacles. These fish thrive under anemone protection, and they pay their hosts back by eating parasites and stirring water circulation with their fins. They sting fish and other prey with tentacles armed with hollow, harpoonlike filaments that deliver toxic venom. An anemone’s tentacles surround a central mouth, which feeds the invertebrate’s single body cavity.

While most anemones prefer to attach themselves to immovable objects, others adorn crab shells, loose rocks, or plants. And like flowers these invertebrates generally stay put—stuck to seafloor rocks or coral reefs. These close relatives of coral and jellyfish are found in ocean waters all over the world, from shallow tidal zones to depths of 33,000 feet (10,000 meters). Robert Ballard, as he reveals the details behind this story of stealth, subs and superpowers.
A female found in a deep canyon off the central California coast guarded her eggs for four and a half years. A friend introduced him to backcountry horsemanship, and the wilderness and animal relationship gave him hope and peace of mind. You have to trust your horse to get you places safely, and they trust you not to take them into danger. With no natural predators, lionfish populations have exploded throughout the waters of the Caribbean and U.S.
The other fish would dodge and angle his body so he could be hit but the stinger would not release its venom. By providing the plant with a safe pasture, the anemone benefits from the by-products of algae photosynthesis—sugar and oxygen.
That one cavity performs the roles of the stomach, intestines, lungs, circulatory system, and other critical bodily systems.
But when need arises, many anemones can move, detaching to drift with the currents or, in some cases, “swimming” short distances with an awkward stroke. To inspire others to use wilderness and horses to overcome their struggles, Knell embarked on a 1,000-mile ride along the Continental Divide with Mustang Sally and two mules, Top Gun and Magic.
Filmmaker Ben Masters joined Knell through Yellowstone to see the grandeur of our country’s first national park and to witness the importance of conserving wilderness to heal ourselves. The amount of toxin (pound per pound) must be small enough and well tolerated by sharks (I know, stating the obvious) and it is generally tolerated by people.Staff at the the pet store I frequent tell stories about getting stung and are grateful that they are not among those who happen to have an allergy to the toxin and experience anaphylactic shock.

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