What gives sharks their extraordinary speed, agility and endurance? It’s not just their muscles or powerful tails – it’s the hidden architecture inside their spines. Using high-resolution micro-CT imaging, researchers found that great white, shortfin mako and porbeagle sharks have rigid, mineral-rich spines built for speed, while sand tiger sharks evolved more flexible vertebrae for maneuverability. Common thresher sharks have reinforced spinal structures for powerful tail strikes, and basking sharks possess lightly mineralized spines adapted for slow, energy-efficient cruising.

More than 120 fish species have already migrated from the Red Sea to the Mediterranean since the opening of the Suez Canal over 150 years ago. Now, researchers at Tel Aviv University have developed a statistical model capable of predicting which species are likely to be next.

Mixed teams of scientists and members of the general public have discovered two new snail species in northwestern Montenegro, with the findings published in the open-access, peer-reviewed Biodiversity Data Journal. The discovery underscores the region's importance for hidden biodiversity. It also adds weight to local conservationists' calls for the Komarnica Canyon to be included in the Durmitor World Heritage Site, and for plans for a hydropower reservoir there to be scrapped.

Identifying bird songs using artificial intelligence has now become standard practice in nature conservation. However, in remote regions, practical application has often been hampered by the lack of a mobile network. The new BirdNET Live app is changing that: its AI models recognise more species than other apps and run entirely locally on the smartphone – without any internet connection at all. This enables researchers, rangers and citizen scientists to carry out structured acoustic surveys even in the most remote corners of the globe.

Invasive rats on tropical islands are creating winners and losers among the tiny underwater animals near the bottom of the food chain that inhabit surrounding coral reefs.

Researchers at Lancaster University and the University of Texas say the changes to these marine ecosystems can rewire food chains on the reefs.

Results show that the main mode of seabird nutrients moving up food webs is through fish, which feed both specialised fish-eating predators and more generalised carnivores. As such, when seabird nutrients are added or taken away from ecosystems, there is a rewiring of how energy travels up food webs, and a reconfiguration of larger fish communities.

Wild seabirds that face high energy demands during the breeding season go on to migrate farther and raise more chicks the next year, but at a cost to their own survival. An international team, led by researchers from Nagoya University, raised the energy cost of flight for some birds and tracked them through the next year of their annual cycle. The researchers introduce a concept called "energetic flexibility" and offer rare experimental evidence for how the costs of one season carry over to shape the next. The study appears in Proceedings of the Royal Society B.

Scientists studying saber-toothed cats which became trapped and died in the La Brea Tar Pits have found that these animals had a high range of spinal deformities, including serious developmental abnormalities and widened holes in their vertebrae which indicate the presence of spinal nerve tumors. These tumors are extremely rare in humans and modern animals; in humans they’re caused by a particular genetic mutation. Scientists think that as the saber-toothed cat population shrank, fewer potential mates were available and pathogenic genes became more common. The painful, disabling tumors would have made it hard to hunt, which could explain why the saber-toothed cats were scavenging for easy prey in the tar pits. 

Kyoto, Japan -- As close relatives of humans, chimpanzees had sometimes been used in biomedical experiments. They were instrumental in the identification of the hepatitis C virus: the then mysterious pathogen was artificially injected into chimpanzees for study, leading to its eventual identification in 1989. Since then, treatments for humans have advanced and hepatitis C can now be nearly cured with medication. However, the same treatment has not been extended to the chimpanzees.

In 2022, a team of researchers from Kyoto University found that chimpanzees infected with hepatitis C had experienced negative health effects and shorter lifespans. This time, in a collaboration with Kumamoto University, the team was determined to eliminate this virus in chimpanzees residing at Kumamoto Sanctuary, a research facility of Kyoto University’s Wildlife Research Center. The sanctuary is home to several chimpanzees who were once used in medical experiments by multiple organizations in Japan, and is a place where they can spend the rest of their lives being cared for.

"Prioritizing chimpanzee health and welfare is the number one reason for conducting this study," says first author Satoshi Hirata. "We felt that it is our responsibility to do whatever we can to improve their condition."