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.