The dumbo octopus has a distinct characteristic, what was once thought to be white spot(s) above their eyes, near the base of the fins is transparent patches. Not all the octopus species have fins. There are around 300 species of octopus and they are found in every ocean. Octopuses are highly intelligent animals, masters of camouflage that have evolved an array of tricks over tens of millions of years to avoid or thwart would-be attackers. [3] Prey include crustaceans, bivalves, worms and copepods. [29][30] Although it has been suggested that species of Grimpoteuthis are capable of jet-propulsion, this has since been deemed unlikely. Unlike most octopuses, the Dumbo octopus doesn’t have an ink sac because it rarely encounters predators in the deep sea. Both males and females have an instinctive drive to mate once the age of maturity is attained. In 2018, Shea et al. Earwigs lay eggs in your ears; Answers 1. [28], Specimens of Grimpoteuthis have been observed to swim by using movement of the fins. The Grimpoteuthis does not have an ink sac and therefore, they change colors and size due to their chromatophore cells that helps them protect themselves from predators. (2003). Grimpoteuthis is a genus of pelagic umbrella octopuses known as the dumbo octopuses. [24], Species of Grimpoteuthis are assumed to have a worldwide distribution, living in the cold, abyssal depths ranging from 1,000 to 7,000 metres. To most people, these might appear like ears, but they are actually fins. The Dumbo octopus is named after Disney’s Dumbo the elephant character, from the eponymous movie, that was famous for its big ears. Some even make a door for themselves—a rock pulled into place once they’re safely tucked into their homes. (2003). This sac-like chamber contains peculiar mineralized components, alongside strands of sensitive hair, which may act like the ones humans have in their inner ears. They’ve also can develop opinions about people; one routinely squirted water down the back of a keeper it seemed to dislike. If a predator gets too close octopuses can escape quickly, shooting themselves forward by expelling water from a muscular tube called a siphon. Their soft bodies mean octopuses can fit into impossibly small nooks and crannies, as long as the holes are not smaller than the only hard parts of their bodies: their beaks. As such, they lack a sensory system that detects changes in pressure that correspond to sound. Instead of ink sacs, dumbo octopuses take advantage of a strand-like structure on their suckers to help them sense the surrounding environment as well as looking for food. Specimens have been found off the coast of Oregon, the Philippines, Martha's Vineyard, the Azores, New Zealand, Australia, California, Gulf of Mexico, Papua, and New Guinea. The male octopus uses one of its specialized tentacles to deliver the sperm to the female’s mantle cavity. Find out about these and other octopus facts. The research is described in the latest issue of the journal Comparative Biochemistry and Physiology, Part A. Size. Another shot a jet of water at a light to cause a commotion. ... Answer: True! The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film Dumbo, having a prominent ear-like fin which extends from the mantle above each eye. The giant Pacific octopus (Enteroctopus dofleini) is often cited as the largest known octopus species. Ears are generally limited to vertebrates. The latter spans from about 20Hz to 20,000Hz. [31] Dumbos hover above the sea floor, searching for polychaete worms, pelagic copepods, isopods, amphipods, and other crustaceans for food. © 1996-2015 National Geographic Society, © 2015- Octopuses can also release a cloud of black ink, which obscures them and dulls an encroacher’s sense of smell. In previous studies, it has been demonstrated that blind octopuses are able to detect sounds inside water, be they from an incoming boat, or from taps drummed on the walls of the tanks they were in. Octopuses have detachable penises. These patches function to detect (unfocused) light. The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (156.5 lb). Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft). (2003). [citation needed], As noted above, many species collected on the Challenger expedition were initially classified in the genera Cirroteuthis and Stauroteuthis. 2. “Cephalopod” is Greek for “head-foot,” which makes sense, since their limbs are attached directly to their head. [33] All rights reserved. There are "hearing organs" such as the tympanic membrane in certain invertebrates, but not in the case of the octopus. Male octopuses have a separate protuberance on one of their arms that carries an encapsulated sperm packet to the female.

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