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The Lead Cal Flyn's book, The Savage Landscape, is a wondrous personal journey to locate and understand wilderness. It's a work of extraordinary physical and narrative movement that takes us from the depths of the ocean to volcanoes and icebergs, but is also a journey into our own psyches, and the stories we tell ourselves about “wild” landscapes. Exploring the Human Connection to Wilderness Off the coast of California, two miles down, there exist geothermal nurseries: gatherings of tens of thousands of small violet octopuses, each the size of a grapefruit. Known as pearl octopuses (Muusoctopus robustus), they congregate around hydrothermal springs which warm their eggs, allowing them to hatch in less than two years (in cold water it can take 10 years). When I want to calm my mind, I think of these gatherings, this factory of octopuses powered by the Earth’s energy that exists quietly away from our gaze, and might easily never have been discovered. How many more such worlds exist? The Fiction of Untouched Wilderness The notion of untouched wilderness is a fiction, and Flyn continually pulls the rug from under our assumptions about purity, wildness and isolation. At the Monastery of Saint Paul the Anchorite, in Egypt’s eastern desert, she talks with a coptic monk who has dedicated himself to a life of isolation and prayer, and yet continually checks his smartphone. Aboard a cruise ship in the Southern Ocean, Flyn admires icebergs crashing down, “a silent display of staggering sublimity”, only to reflect on the clutter left behind by tourists and scientific researchers on the Antarctic landmass; according to one group of researchers, only 31% of Antarctica can now be considered “inviolate”. The Impact of Human Activity on Wilderness In Transylvania, home to the largest population of brown bears in Europe, she explores painful stories of people and wildlife in conflict. Bears and wolves fared well in Europe until the destruction of their habitat in the middle ages brought them into direct contact with local populations. These creatures can be savage, and Flyn spares little detail in her evocation of the damage they can wreak to human flesh, but the most terrifying creature in the chapter is not ursine or lupine: it is a local’s sheepdog, a domesticated animal whose snarl is “a white noise of pure violence”. The Future of Wilderness and Conservation Flyn sees in the Bon a kind of inspiration: “Sacred landscapes of the kind found in Dolpo,” she writes, “effectively comprise the world’s oldest conservation projects, and there is a lot that we can learn from their longevity.” I don’t know how the beliefs and practices of the Dolpo might be applied at the bottom of the sea, but surely Flyn is right: if we are to escape the course of ecological destruction, we will need more stories, like hers, that can reignite a sense of awe and respect for the worlds we know, and others yet undiscovered.

The LeadGiant "kraken-like" octopuses that used powerful beaks to crunch through bones of prey were among the most formidable predators of the Cretaceous oceans, according to research. Analysis of dozens of newly identified fossils reveals that some ancient octopus species reached up to 19 metres in length, meaning they would have rivalled – and possibly even preyed upon – apex predators such as mosasaurs and plesiosaurs.The Ancient Octopus DiscoveryDistinct wear patterns on the enormous fossilised beaks, which date back up to 100m years, suggest they would have routinely crushed hard bones and shells. "Our study shows that these were not simply large versions of modern octopuses," said Dr Yasuhiro Iba, a palaeontologist at Hokkaido University and lead author of the research. "They were giant predators at the very top of the Cretaceous marine food web. This changes the view that Cretaceous seas were dominated only by large vertebrate predators."Fossil Evidence and AnalysisUntil now, relatively little has been known about ancient octopuses, whose soft bodies are very rarely preserved as fossils. The study relied on detailed analysis of fossilised beaks, a hard, structure that is the only rigid part of an octopus's body. The team re-examined 15 large fossil beaks that had previously been assigned as vampire squids, but which the latest analysis concludes belonged to a group of ancient octopus relatives known as Nanaimoteuthis. Using digital imaging, the team also uncovered an additional 12 octopus beaks hidden within Cretaceous rocks, dating to 72m to 100m years ago.Size and Predation AnalysisOne species, Nanaimoteuthis haggarti, was found to have a beak larger than that of the modern giant squid, a creature that reaches about 12 metres in length and until now had been regarded the largest known invertebrate. By using the relationship between jaw size and body length in modern finned octopuses, the team estimated that N haggarti was between 7 and 19 metres in total length, which could make it the largest invertebrate on record.Expert PerspectivesDr Thomas Clements, a palaeobiologist at the University of Reading, who was not involved in the research, said: "To see a beak this size is quite amazing, to be honest. It was a massive animal. I certainly wouldn't have wanted to go swimming in the ancient oceans if these things were swimming around." Modern octopuses do not swallow prey whole but use their long, flexible arms to capture and subdue the prey and then dismantle it with their beak. The ancient specimens showed distinct patterns of wear that pointed to a similar predation strategy.Predation Behavior and DietIn the largest individuals, the beaks showed extensive wear, with once sharp features, as seen in small juveniles, becoming blunted and rounded over time, and chips and scratches also visible. Iba said: "It probably used its long arms to seize prey and its powerful lower jaw to crush hard structures such as shells or bones. The strong wear on the jaws indicates frequent processing of hard prey." This would have included bony fish, shelled animals and, possibly, giant marine reptiles such as mosasaurs, which would have been comparable in size.Behavioral SophisticationThe beaks appeared more worn on one side more than the other – evidence of so-called lateralised behavior. This suggests they may have had arm preferences (handedness) for specific tasks, as modern octopuses do, favouring some arms for exploration and others for feeding. Iba said: "This indicates that these animals were not only powerful, but also behaviourally sophisticated predators."Scientific Impact and Future ResearchClements said: "Whenever you see artistic reconstructions, it's always a vertebrate eating a cephalopod. It is quite nice to imagine an octopus eating a large vertebrate for once. As a cephalopod researcher I'm very excited to see invertebrates that may have rivalled vertebrates." The findings are published in the journal Science, opening new avenues for understanding the complexity of ancient marine ecosystems and the role of invertebrates in prehistoric food webs.

Scientists have shed new light on the mating habits of octopuses, revealing that male octopuses use a specialized arm to detect female hormones and mate without visual contact.The arm, called the hectocotylus, is used to place a package of sperm inside the female's reproductive system. Researchers at Harvard University have found that this arm is a sensory organ, similar to a tongue, that can detect the female hormone progesterone.This allows the male to seek out and fertilize a mate, even if it cannot see its sexual partner. The study, published in the journal Science, shows that the arm is both a sensor and a mating organ, and that it plays a crucial role in the mating process.The researchers, led by Prof Nicholas Bellono, found that the arm can detect progesterone through receptors on its tip, and that this sensitivity is specific to progesterone and not other hormones.The study provides new insights into the evolution of sensory systems and the importance of chemical cues in mating behavior. It also highlights the complex and fascinating world of octopus biology, and the importance of continued research into the natural world.