The ‘bone collector’ caterpillar covers itself with body parts

It’s like something from a horror movie. A creeping, carnivorous creature that in a macabre attempt at disguise and protection, covers itself with the dismembered remains of dead insects. This super-rare caterpillar is one of the strangest insects in the world. It lives on spider webs inside of trees and rock crevices in a 15 square kilometre radius on the Hawaiian island of O’ahu. Daniel Rubinoff, from the University of Hawaii Insect Museum, found about 62 of these caterpillars over the past 20 years. Their research was published in the journal Science.

If a dolphin pees in the water, does anybody know it?

Researchers observing river dolphins in Brazil were first surprised to see the animals turning on their backs and urinating into the air, and then further amazed to see other dolphins sampling the falling stream. The Canadian and Brazilian team, led by Claryana Araújo-Wang from the CetAsia Research Group, believe this aerial urination may be a way to communicate dominance among males. The research was published in the journal Behavioural Processes.

How the snowball Earth made life bloom on our planet

700 million years ago our planet was frozen from pole to pole during a period known as snowball Earth. Glaciers at that time scoured deep into the continents below like a giant bulldozer, grinding the rock into fine sediments. In a new study in the journal Geology, scientists found that as the glaciers melted, a lot of that loose material was injected very rapidly into the oceans. Branden Murphy, from St. Francis Xavier University, said this chemical cocktail fertilized the oceans, and set the stage for rise of multicellular complex life on Earth.

How a team of microbiologists use cars to sample air across the country

Understanding the distribution of bacteria that might be a concern for human or animal health across an entire country is a huge job. But a team from Laval used a very clever shortcut to gather their data. They collected car air filters from vehicles across the nation, and looked in them to see what they sucked up. They found regional differences in the antimicrobial resistance genes specific to the agricultural activities and environmental factors at each location. Paul George, from Laval University, was the lead researcher on the study published in the journal Environmental DNA.

Albertan obsidian artifacts are the end point of a widespread Indigenous trade network

Obsidian — volcanic glass used to make super-sharp tools — is found as artifacts from chips to blades to arrowheads at hundreds of sites across the Rockies of Alberta and B.C., dating back thousands of years. However, there are no volcanos in the area so archaeologists are using this volcanic glass to chart Indigenous trade routes through North America. New research, led by Timothy Allan of Ember Archeology, has traced the obsidian’s point of origin to a site nearly 1,000 kilometres away, suggesting the material travelled over long distances and passed through many hands. The research was published in the Journal of Field Archaeology.

Do his gills ring a bell? Fish can recognize humans

Scientists at a Mediterranean research station kept noticing that particular fish would follow them around whenever they would try and do experiments. To find out if the fish were actually capable of recognizing individual humans, a team from the Max Planck Institute of Animal Behavior in Germany decided to turn this annoying behaviour into a scientific experiment. They found that the fish were indeed capable of remembering which humans had shared tasty treats in the past. The research was published in the journal Biology Letters.

All the colours of the rainbow, plus one

Researchers have fired lasers directly into the eye to stimulate photoreceptors, and produce the perception of a colour that does not exist in nature. They describe it as a “supersaturated teal,” and hope the technique will allow them to better understand colour vision and perhaps lead to treatments for vision problems. Austin Roorda has been developing this technology using mirrors, lasers and optical devices. He is a professor of Optometry and Vision Science at University of California, Berkeley. The study was published in the journal Science Advances.

Following in the footsteps of an ancient ankylosaur

Paleontologists have found fossil footprints of an armoured dinosaur in the Canadian Rockies that fill in a critical gap in the fossil record. The footprints belonged to a club-tailed ankylosaur about five to six metres long, and are the first evidence of this type of dinosaur living in North America in a period known as the middle Cretaceous. The research was led by Victoria Arbour, curator of paleontology at the Royal B.C. Museum, and published in the journal Vertebrate Paleontology.

Did the Neanderthals die from sunburn?

Neanderthals disappeared 40,000 years ago, and new research suggests this corresponds to a period of weakness in the Earth’s magnetic field that allowed an increase in the solar radiation reaching the surface. Researchers think they have evidence that modern humans were able to protect themselves from the sun better than Neanderthals could, and this might have contributed to the Neanderthal extinction. Raven Garvey is an anthropologist at the University of Michigan. Her team’s research was published in the journal Science.

Cloudy with a chance of ammonia mushballs

New observations and models of activity within Jupiter’s stormy atmosphere is giving a weather report for the giant planet, and it’s pretty extreme. Most interestingly, researchers predict conditions that could lead to violent lightning storms producing softball sized frozen ammonia “mushballs” that would rain through the upper atmosphere. The research was led by Chris Moeckel, a planetary scientist and aerospace engineer at the University of California-Berkeley Space Sciences Laboratory, and was published in the journal Science Advances.

Shattering heat records: climate change is turning out to be worse than expected

In the last few years, we’ve seen global temperatures rising faster, with more extreme localized heatwaves, than climate models predicted. Climate scientists are trying to understand this by investigating the underlying factors behind these heating trends.

Richard Allan, from the University of Reading in the U.K., was expecting a larger than normal rise in global temperatures due to natural fluctuations, but global temperatures in 2023 and 2024 were much higher than expected. Their recent study in the journal Environmental Research Letters found a growing imbalance in the earth’s heat system, with increasingly more heat coming in than leaving, in large part due to changes we’ve seen in global cloud cover.

This global heating is not happening evenly around the world. Kai Kornhuber, from the International Institute for Applied Systems Analysis in Austria and Columbia Climate School in New York, found regional hotspots that are experiencing unexpected extreme heat, likely due to a combination of factors. That study is in the journal PNAS.

How a helpless baby bird protects itself from hungry hunters

There’s not a more vulnerable creature in nature than a baby bird. Tiny and immobile, they’re easy pickings for predators. But the chicks of the white-necked jacobin hummingbird have evolved a unique defence. They disguise themselves as poisonous caterpillars to discourage those that might eat them. Jay Falk, an NSF postdoctoral fellow at the University of Colorado and Scott Taylor, director of the Mountain Research Station and associate professor at the University of Colorado, studied these birds in Panama. Their research was published in the journal Ecology.

Seals have a sense of their oxygen levels, which makes them better divers

Seals can dive at length to tremendous depth thanks to some remarkable adaptations, like the ability to collapse their lungs, and radically lower their heart rate. Chris McKnight, a senior research fellow at the University of St Andrews Sea Mammal Research Unit in Scotland, led a study looking to see if tweaking oxygen and C02 levels changed the seals’ dive times. The researchers discovered that the seals have the unique ability to measure the oxygen levels in their tissues, so they can anticipate when they need to return to the surface before they get into trouble. The research was published in the journal Science.

Fruit flies can show a playful side

As the joke goes, time flies like an arrow, fruit flies like a banana. Researchers recently demonstrated that fruit flies enjoy more than just aged produce. Using a custom carousel built to fly scale, scientists found that some, but not all, of their fruit flies would play on it, enjoying an activity that had nothing to do with the necessities of life. This brings up the possibility of variability in personality for fruit flies. Wolf Hütteroth is an associate professor at Northumbria University, Newcastle and was part of the team, whose research was published in the journal Current Biology.

Scaring krill with a dose of penguin poo

Krill, the small, shrimp-like creatures that swarm the world’s oceans and are particularly abundant in southern oceans, play a big role in marine food webs, connecting microscopic organisms with many of the oceans’ larger animal species. Researchers in Australia investigated how krill respond to predator cues, like the smell of their feces. Nicole Hellessey, from the University of Tasmania, said the mere whiff of penguin feces affects the Antarctic krills’ feeding behaviour and causes them to take frantic evasive action. The study is published in the journal Frontiers in Marine Science.

Fossils tell us what dinosaurs were. How do we know what they did?

Dinosaur bones can tell amazing stories about these prehistoric beasts, but how do we piece together how they behaved? A new book dives into the many lines of evidence that can shed light on the behaviour of these extinct creatures. From fossils, to tracks they left behind, to their modern day descendents, paleontologist David Hone from Queen Mary University of London explores how scientists develop robust theories about how dinosaurs lived in his new book, Uncovering Dinosaur Behavior: What They Did and How We Know.

A tree has evolved to attract lightning strikes — to eliminate the competition

Scientists working in Panama noticed that a particular tropical tree species was frequently struck by lightning, but was infrequently killed by the strikes. Forest ecologist Evan Gora found that Dipteryx oleifera trees were often the last ones standing after a lightning strike, which can kill over 100 trees with a single bolt. His team discovered the giant trees were more electrically conductive than other species, which allows them to not only survive strikes, but also channel lightning into parasitic vines and competing trees around them. The research was published in the journal New Phytologist.

Anti-anxiety drugs we pee out could be affecting wild salmon

Our bodies only process some of the pharmaceuticals we take, which means when we pee, we’re releasing traces of drugs into the ecosystem. A study of the impact of trace amounts of anti-anxiety drugs on juvenile salmon suggests they might become too brave for their own survival. Jack Brand is a researcher at the Swedish University of Agricultural Sciences and led the research published in the journal Science.

Fossil discovery gives new insight into the mysterious Denisovans

A jawbone pulled up by fishers off the coast of Taiwan in 2008 has proven to be a unique discovery. Analysis of preserved protein in the fossil has proved it is from a male Denisovan — a mysterious species of ancient human known from only fragmentary bones and ancient DNA. This gives new insight into how widespread this mysterious branch of humanity was. The research was led by a team including Takumi Tsutaya and Enrico Cappellini at the University of Copenhagen, and published in the journal Science.

Earth’s inner core is a lot more dynamic and smushy than we previously thought

Scientists used to think the inner core of our planet was a solid sphere of metal, but a new study in Nature Geoscience suggests its softer outer layers shift and deform over time. The researchers used pairs of earthquakes from the same location as X-rays to peer inside Earth to gauge what the inner core is doing; much like a stop-motion film. John Vidale, from the University of Southern California, said this insight can shed light on how a planet like ours evolves.

Human noise has an impact on wildlife — here are two unique examples

Traffic, aircraft, industry, construction. Our world is saturated with artificial noise. We know noise impacts us and other animals, but new research is shedding light on how past experiences factor into the ways wildlife adapt to our noise pollution.

Researchers in one study in Animal Behaviour found that yellow warblers in the Galapagos Islands that live closer to traffic become aggressive when defending their territory in noisy conditions compared to birds in quieter areas. Çağlar Akçay, from Anglia Ruskin University, said the birds exposed to more traffic have learned their warning calls aren’t as effective when things get too noisy; and they resort to physical violence.

Another study in Current Biology shows how spiders that are exposed to loud noises construct their webs differently in ways that could affect their ability to sense vibrations from prey or a potential mate. Brandi Pessman, from the University of Nebraska-Lincoln, found that spiders tune their webs in noisy environments like a volume dial: city spiders turn their web volume down whereas country spiders turn it up.

An attractive new strategy for brain surgery

A Canadian team is developing minimally-invasive micro-tools for brain surgery that can be operated by magnetic fields from outside of the skull. The tools, including scalpels and forceps, will enter the cranium through small incisions, and then be controlled by focused and precise magnetic fields. Eric Diller is associate professor of mechanical and industrial engineering at the University of Toronto and his research was published in the journal Science Robotics.

Animal tool use is fishy

In recent decades scientists have discovered animals from primates to birds and marine mammals can use tools — a capacity once thought to be exclusive to humans. Now scientists have discovered fish using hard surfaces to crack open hard-shelled prey and get at the meaty meal inside. The research, led by Juliette Tariel-Adam from Macquarie University, included recruiting divers and scientists from around the world to report any sightings of tool use, which led to 16 reports across five species of wrasses. The results were published in the journal Coral Reefs.

Bad news — a long cold bath may be good for you

For a hardy few, soaking in cold water has long been held out as being healthful and invigorating. Well, unfortunately, the latest research suggests that they’re right. Volunteers who soaked in cold water for an hour a day for a week showed improvements in autophagy, an important cellular clean-up function that typically declines with age. Kelli King is a postdoctoral researcher at the University of Ottawa and was co-lead on this study, published in the journal Advanced Biology.

How the unicorn of the sea uses its horn

The Narwhal is a small whale distinguished by its long spiral horn — an elongated tooth. Researchers have long speculated about what the ostentatious bit of dentition is actually for, but the elusive narwhal has, until now, been hard to study. Now scientists, including Cortney Watt from Fisheries and Oceans Canada, have used drones to learn that the horn is used in several ways: to play, explore, and forage. The research was published in the journal Frontiers in Marine Science.

Why your body and brain might be fighting your efforts to get and stay slimmer

New research is revealing why it’s so difficult to keep weight off after you’ve lost it.

One study in Nature found that genes in the fat cells of people who lost a significant amount of weight through bariatric surgery largely continued to behave as if they were still obese. Ferdinand von Meyenn, from ETH Zurich, said that despite these individuals becoming, in many respects, much more healthy, genes that became active during obesity remained active, and genes that were turned off, remained turned off, predisposing them to regain lost weight. In formerly obese mice, their fat cells remained much better at taking up sugars and fats.

In addition, another study revealed that neurons in a primitive part of the brain hold onto memories of fat and sugar that can drive our cravings, according to a study on mice in Nature Metabolism. Guillaume de Lartigue, from the Monell Chemical Senses Center and the University of Pennsylvania, said specific neural circuits in the brain light up, depending on whether the gut received sugar or fat. Removing these neurons protected the mice from diet-induced weight gain, something de Lartigue is hoping to translate to humans to dial down impulsive eating behaviour.

One whale’s waste is an ocean organism’s treasure

The nutrients in the ocean are not evenly distributed. Resources tend to be rich around coastlines and near the poles, and are often poorer in the open ocean and the tropics. A new study has explored how urine from migrating baleen whales is a significant way that nitrogen and other nutrients are circulated in the oceans. Joe Roman is a conservation biologist at the University of Vermont. He led the research, published in the journal Nature Communications.

The underground economy: Fungi and plants trade have a network under our feet

Scientists have used a custom robot to track the growth of a complex underground supply-chain network that forms between more than 80 per cent of the plant species on Earth and symbiotic fungus. This allowed them to trace the flow of carbon and nutrients across this network, that draws about 13 billion tons of carbon dioxide into the soil each year. Toby Kiers, from Vrije University in Amsterdam and the Society for the Protection of Underground Networks led the work, published in the journal Nature.

Researchers capture wild sharks to get sperm samples for captive breeding

In a world-first, a team of marine biologists and veterinarians collected semen from endangered wildsharks in an effort to maintain a population of genetically healthy sharks. Christine Dudgeon, from the University of Queensland and the Sunshine Coast and the Biopixel Oceans Foundation, used some of that sperm to artificially inseminate captive females.

Watching planets form in a baby solar system

370 light years away, around a newborn star only five million years old, two planets are forming from the disk of gas and dust still orbiting around the star. Canadian researchers are using instruments on the James Webb Space Telescope to observe this process, and understand how the nascent planets are competing with the star for material as they grow. Dori Blakely, a PhD candidate at the University of Victoria, was the lead researcher on this article published in The Astronomical Journal.

Butterfly populations are declining. Meet the people moving a forest to save them.

A new study is bringing hard data to help us understand how butterfly numbers have declined steeply in recent years, due to the combination of habitat loss, climate change, and pesticide exposure. The research, co-led by Elise Zipkin, found that overall, across the United States, butterfly numbers are down 22 per cent over the past 20 years. The research was published in the journal Science.

A different group of scientists is hoping to fix at least one of these problems for one species, by moving an entire forest in Mexico. The sacred fir trees, where monarch butterflies spend their winters, are struggling under climate change. Recently a team of researchers planted a thousand sacred fir trees at a new location at higher elevations to kickstart a new, future-proof forest for the butterflies to overwinter. After a few years, the researchers report the trees are doing well, in a recent paper published in Frontiers in Forests and Global Change.

Quirks producer Amanda Buckiewicz spoke to Cuauhtémoc Saénz Romero, a forest geneticist at the University of Michoacán in Mexico, and Greg O'Neill, a climate change adaptation scientist with the BC Provincial Government in the Ministry of Forests.

Is our universe inside a black hole? New evidence from JWST galaxy images

New images from the James Webb Space Telescope of distant galaxies could support a mind-bending idea: that our universe was born in a black hole. The images show more of these galaxies spin clockwise, than counterclockwise. Lior Shamir, a computational astrophysicist from Kansas State University, says that may mean our universe inherited the spin of the black hole we’re currently living in, though he thinks its more likely that there’s something wrong with how we’re measuring objects in deep space. The study is published in the Monthly Notices of the Royal Astronomical Society.

Modern-day Antarctic explorers go where no-one has gone before

CBC Reporter Susan Ormiston spent a month on the Canadian Navy ship HMCS Margaret Brooke as it took a team of 15 scientists on a research trip to Antarctica. She brings us the story of Kevin Wilcox, a researcher using an uncrewed sonar vehicle to map the previously inaccessible near-shore waters of the icy continent.

Finding out what juvenile sea turtles do during their ‘lost years’

Once baby sea turtles swim away from their natal beaches, they enter what marine biologists call their “lost years,” a time of critical growth spent wandering the open sea. A new study is filling in the picture of what they do during this time. The research, led by marine ecologist Katrina Phillips, involved playing a game of oceanic hide and seek to find and track over 100 sea turtles as they moved through the ocean. The work was published in the journal Proceedings of the Royal Society B.

Concrete plans to transform cement production’s CO2 waste into new building materials

Cement production is responsible for five to eight per cent of global carbon dioxide emissions. A new study suggests that waste could be made into even more construction materials. Inspired by the way sea creatures build shells, Allesandro Rotto Loria — a civil and environmental engineer from Northwestern University — says they can use CO2 to boost the process to produce carbon-negative materials that could be used in materials like plaster, cement and as a replacement for sand in concrete. Their research is in the journal Advanced Sustainable Systems.

A Dinosaur expert goes green — with a deep look at plant evolution

Paleontologist Riley Black has authored several books on dinosaurs. But she realized she had been neglecting the organisms that made dinosaurs – and all other animals – possible: plants. Her new book, When the Earth Was Green: Plants, Animals, and Evolution's Greatest Romance, looks at how plant fossils are telling the billion-years old tale of the evolution of complex life on Earth, from creating the oxygen that we breathe, to coaxing us out of the water and onto land, and even forming the forests that humans evolved in, which shaped our very anatomy from long arms and grippy toes.

Watching polar bear mums and cubs emerge from their winter dens

Polar Bear mothers spend the winter in warm and cozy dens, gestating and then birthing their cubs, and right about now the baby bears are taking their first steps out of the dens and beginning to explore the real world. Using satellite collars and remote camera technology, researchers from Polar Bears International, the Norwegian Polar Institute, and the San Diego Wildlife alliance, now have an exciting new picture of how and when they leave their winter refuges. The team included Louise Archer, Polar Bears International Postdoctoral Fellow at the University of Toronto Scarborough, and their observations were published in The Journal of Wildlife Management.

Lousy sleep? It’s quality, not quantity that may be your problem

Researchers from the University of Toronto Mississauga have compared sleep in modern, industrial societies with non-industrialised societies, such as remote tribes in Tanzania and the Amazon. The team, led by anthropologist David Samson, found that people in modern societies sleep for significantly longer, but have weaker natural circadian rhythms, and so their sleep is not as functional as it should be. The researchers say that could be because people in industrial societies have lost touch with cues that regulate our circadian rhythms, like light and temperature changes. The results were published in the journal Proceedings of the Royal Society B.

Greenhouse gases are messing up low-earth orbit for satellites

While greenhouse gases are warming the Earth’s surface, they’re paradoxically cooling the upper atmosphere, causing it to contract. And this means trouble for low-earth orbit as space junk and defunct satellites are not running into the tenuous atmosphere and falling out of orbit as fast as they used to. This is making low earth orbit more crowded, and more dangerous. William Parker, a PhD candidate at MIT, led this research, which was published in the journal Nature Sustainability.

A 3.5 billion year old crater in Australia is telling the story of the early Earth

Researchers have discovered shattered rock in an area of rolling hills in Western Australia that they think is evidence of an enormous and ancient asteroid impact. This would be the oldest evidence of an impact crater preserved on Earth, and could tell us about how the surface of our planet was formed, and even how the conditions for life were created. Chris Kirkland, a professor of Geology at Curtain University in Perth Australia, was co-lead on this research with Dr. Tim Johnson. Their work was published in the journal Nature Communications.

Beyond long COVID — how reinfections could be causing silent long term organ damage

It’s now been five years since the COVID pandemic stopped the world in its tracks. The virus is still with us, and continues to make people sick. As many as 1 in 5 Canadians have experienced symptoms of long COVID, but scientists are finding that beyond that, each infection can also lead to long term silent cellular and organ damage. David Putrino, who’s been studying COVID’s long term effects at the Icahn School of Medicine at Mount Sinai in New York City, says even mild or asymptomatic COVID infections can lead to a wide range of silent long term heath impacts — compromising our immune, vascular, circulatory, renal, metabolic, gastrointestinal systems and even cognitive function.