Fossilised footprints from 58 million-year-old rocks in Wyoming reveal that early mammals used marine habitats, pushing back an estimated 9.4 million years of previous assumptions. The prints showed diverse tracks, including those of semiaquatic mammals and artiodactyls.
Researchers identified genetically marked neurons in a zebra finch's forebrain, revealing a landscape of physiology and network roles that mirror those in mammals. This breakthrough advances insight into the fundamental operation of complex brain circuits, suggesting ancient cell types retained features over millions of years.
A new study found that zoo YouTube videos focus disproportionately on mammals, with only 3% of content dedicated to conservation. However, the study also notes an increase in conservation-focused videos in recent years, highlighting the potential for social media to support global conservation education.
The study reveals complex patterns in brain-body scaling, with many large-brained species having low relative brain sizes due to selective pressures. The authors conclude that the evolution of intelligence cannot be solely measured by brain size.
Scientists have discovered fossils of three new species of giant cloud rats in Philippine caves, dating back tens of thousands of years. The rodents filled an ecological role similar to that of squirrels in the US and were resilient for at least 60,000 years, but two of the species disappeared around 2,000 years ago.
Two new species of 120-million-year-old, burrowing mammals are discovered in northeastern China with distinct characteristics. They share specialized digging features and an elongated vertebral column, shedding light on the evolution of fossorial life.
New study reveals that whales and hippos developed unique skin traits for aquatic life, contradicting current dogma. Genetic analysis shows that these traits evolved independently in both groups, with cetaceans losing more skin genes than hippos.
Researchers found that the genetic foundation required for oral venom to evolve is present in both reptiles and mammals. Salivary gland tissues in mammals display a similar pattern of gene activity as snake venom glands, suggesting an ancient functional core shared since the two lineages split hundreds of millions of years ago.
A new Harvard-led study challenges the classic lateral-to-sagittal shift in mammal spine evolution, suggesting a completely different type of backbone function. The research found that nonmammalian synapsids had unique spinal characteristics not seen in modern reptiles or mammals.
A team of researchers overturns the long-standing hypothesis that mammal ancestors moved like modern lizards. They discovered that non-mammalian synapsids moved their backbone in a manner distinctly different from any living animal.
A study found that the HAND2 gene becomes less active in humans as labor nears, suggesting it may play a role in regulating gestation length. The gene evolved to be turned on in uterine linings of placental mammals during pregnancy.
In a new study, researchers found that small mammals in the Rocky Mountains are shifting their ranges upward by over 400 feet due to climate change. The golden-mantled ground squirrel and other species are climbing higher to escape warming temperatures, with some moving up by as much as 1,100 feet.
A global study led by UCC researcher Samantha Ball found 'runway roadkill' increasing by up to 68% annually, costing aviation authorities millions per annum. The study identified 47 countries with reported mammal strikes, including bats, rabbits, and coyotes, highlighting the need for effective Wildlife Hazard Management Plans.
A new study finds that small mammals in the Mojave Desert are more resilient to climate change than birds, due to their ability to escape the sun in underground burrows. This difference is likely due to their lower cooling costs and tendency to be active at night.
A new study reveals that despite living in the same Mojave Desert location, mammal and bird communities experience different exposures to climate warming. Small mammals have remained relatively stable, while bird occupancy and species richness have declined dramatically due to their limited ability to mitigate rising temperatures.
The study found that bats accounted for the greatest proportion of strikes in Australia, while rabbits and dog-like carnivores dominated Canada, Germany, and the UK. Average mammal strikes per year ranged from 1.2 to 38.7 across countries, with estimated annual costs exceeding $100 million.
A team of researchers rediscovered a species of mouse thought to be extinct after Mount Pinatubo's devastating eruption 30 years ago. The survey revealed that native rodents were abundant and thriving in the disturbed landscape, contradicting expectations.
A comprehensive analysis of land mammal composition across mapped Indigenous lands reveals that 2,175 mammal species have at least 10% of their ranges within these lands. The study highlights the importance of Indigenous peoples' lands for biodiversity and ecosystem services, with 413 threatened species occurring in these areas.
A study by São Paulo State University reveals that large fruit-eating mammals like peccaries and tapirs increase soil nitrogen levels, making areas more fertile for plants. This boosts plant growth, supporting the ecosystem, particularly in tropical forests.
The genomes of platypus and echidna have been published in Nature, providing a valuable resource for research on mammalian biology and evolution. The study sheds light on the unique biology and reproductive strategy of these animals, offering new leads for drug development and genetic management of threatened populations.
Researchers mapped the platypus genome to understand its evolution, discovering that it carries genes from a common ancestor with birds and reptiles. The study found that platypuses lay eggs due to retained vitellogenin genes, produce milk through sweat, and have venomous spurs.
Research shows that mammals with larger brains tend to be less abundant in local areas than those with smaller brains. This is because bigger brains require more food and other resources, leading to a need for more space. Understanding which animals are most abundant in different areas is crucial for conservation.
Researchers discovered a nearly complete skeleton of Adalatherium, a giant mammal that defies explanation due to its unusual trunk vertebrae and limbs. The creature's front legs were adapted for sprinting, while its hind legs resembled those of crocodiles.
A study by UC Santa Cruz professor Terrie Williams explores how marine mammals' physiological adaptations can help understand the effects of COVID-19. Marine mammals have evolved mechanisms to protect critical organs during low-oxygen conditions, which may inform strategies for humans to mitigate long-term damage from oxygen deprivation.
A new study reveals that dolphins adjust their heart rate to suit the length of their planned dive, conserving oxygen and avoiding decompression sickness. This conscious adjustment allows them to safely dive for long periods, providing insights into marine mammal physiology.
A large international consortium has sequenced the genome of 130 mammals and analyzed existing data to identify important DNA positions. This information can help researchers understand disease mutations in humans and preserve endangered species.
The study reveals that mammal defaunation has wiped out over 40% of ecosystem services provided by mammals, such as ecotourism and disease control. Large-bodied mammals are disappearing fastest, while small-bodied species often perform the same services, with overlapping species among rodents, bats, and apex predators.
A landmark study published in the Journal of Vertebrate Paleontology describes a fossil family that illuminates the origin of perissodactyls, including horses, rhinos, and tapirs. The research provides insights into the evolutionary history of these mammals, suggesting they evolved in isolation in or near present-day India.
A newly discovered 220-million-year-old cynodont, Kataigidodon venetus, has been found in Arizona's Petrified Forest National Park. The discovery provides insight into the early evolution of mammals and their closest relatives.
A new study reveals that mammals developed social behavior much earlier than previously thought, interacting with dinosaurs in tightly packed clusters. The fossils, which are about 75.5 million years old, show evidence of multiple mature adults and subadults congregating, indicating a complex social structure.
A tiny jaw from Greenland has revealed the earliest known example of dentary bone with two rows of cusps on molars and double-rooted teeth, offering insights into mammal tooth evolution. The discovery suggests that complex occlusion and double-rooted teeth developed together in early mammals.
Research on 200 million-year-old mammal teeth reveals they functioned like reptiles, living up to 14 years. Fossilized cementum rings were used to determine lifespan, contradicting previous warm-blooded mammal assumptions.
A recent study shows that rare terrestrial mammals and birds are more threatened by human activities than common species, with many facing extinction within 40 years due to climate change. Conservation efforts must account for the ecological rarity of these species to ensure their survival.
Researchers discovered two genetic mutations in moles that lead to the development of ovarian and testicular tissues, resulting in high levels of testosterone and aggression. The study sheds light on how DNA changes contribute to evolution and the formation of unique sexual features in mammals.
Researchers found that genetic pathways allowing fish to regrow neurons remain present in mammals, but are turned off, blocking regeneration and healing. The study may advance genetic therapies for blindness and other neurodegenerative diseases.
Researchers found that the formation of the Isthmus of Panama led to a significant reduction in native South American mammal diversity, allowing North American immigrants to thrive. The resulting asymmetry has lasting effects on modern species distribution.
Researchers analyzed isotopic data from Amazonian and African mammals to understand feeding habits and ecosystems. The study found no significant difference in dietary carbon isotope signatures between the two regions, but noted Amazonian mammals had more limited dietary resources.
A study on fossils reveals that native South American mammals were disproportionately extinct, leading to a higher number of North American ancestors in the region. This biotic exchange event resulted from the formation of the Isthmus of Panama.
A study in Borneo found that degraded tropical forests have a high conservation value for 28 tropical mammal species. Mammals tend to avoid heavily degraded areas with open canopies and reduced vegetation density, highlighting the importance of maintaining good quality forest habitat.
Researchers use innovative microscopy method to analyze bird brain structure, finding similarities with mammalian neocortex. The study reveals horizontal and vertical layers, refuting long-held assumptions about avian brain organization.
Two studies found that birds' pallium exhibits a layered architecture similar to mammals', potentially enabling complex cognitive abilities like consciousness. This structure may have been present in the last common ancestor of birds and mammals 320 million years ago, or evolved independently through convergent evolution.
A new study reveals that civil wars have a negative impact on native mammal populations, with increased access to automatic weapons and suspension of anti-poaching patrols leading to population collapse. The authors warn that restoring depleted wildlife populations may take many decades and require active intervention efforts.
Researchers at Kyoto University found that gene regulatory networks for pluripotent stem cells are highly conserved across mammals, but also exhibit unique variations. These differences may explain why certain features of mammalian pluripotent stem cells have evolved differently in various species.
A new fossil discovery has provided critical evidence for the evolution of the mammalian middle ear, revealing the first unequivocal evidence of the five auditory bones from an extinct group. The findings have narrowed the morphological gap between ancient and modern mammals.
A new global review found that big mammals like elephants, rhinos, and primates are threatened with extinction in national parks of the world's poorest countries. Illegal hunting is a major driver of population declines, particularly in Asia where stricter protected areas have higher rates of illegal hunting.
The study reveals a remarkable genetic connection between the tuatara, a reptile that lived with dinosaurs, and mammals such as platypus and echidna. The genome analysis shows an unusual combination of mammalian and reptilian components, with some sequences similar to those found in platypus.
Research has found that the brains of humans, flies, and mice share similar mechanisms for brain development and function. This similarity can be interpreted in two ways: as evidence of a single ancestral brain or independent evolution of brain circuits. The study identified shared genetic regulatory mechanisms controlling brain area f...
A groundbreaking study using MRI scans of 130 mammalian brains found that brain connectivity levels are equal in all species, including humans. The research revealed a universal law: Conservation of Brain Connectivity, which suggests that the efficiency of information transfer in the brain's neural network is the same across mammals.
A study found that animals who try to sound 'bigger' are often skilled sound learners. Researchers analyzed the sounds and body size of 164 mammals and discovered that those who fake their size are frequently good at learning new sounds. This discovery may provide insight into human speech evolution.
New findings reveal that infant marsupials and monotremes use a connection between their ear and jaw bones to drink milk, suggesting an early evolutionary link. This discovery sheds light on the development of middle ear and jaw bones in mammals.
A recent study published in Global Change Biology found that infectious disease-induced mass mortality events occur in 14% of marine mammal species, with viruses causing 72% of these events. Habitat breadth was also a key factor, with pinnipeds being overrepresented among affected species.
A team of experts has conducted a review study on the impact of land-use changes, such as deforestation and urbanization, on the behavior of animals and the risk of disease transmission to humans. The study reveals that there are significant gaps in understanding how these factors affect the spread of diseases from mammals to humans.
The vertebrate ear's unique structure and development have puzzled scientists. A new study proposes that this complexity increased the
A new study reveals that the Late Cretaceous reptile Priosphenodon had a unique type of tooth enamel, similar to that of mammals, which provided it with resilience against tooth wear. The researchers found that the enamel crystals in Priosphenodon were 'woven' into long threads called enamel prisms, a characteristic also found in mammals.
A recent study published in Frontiers in Immunology found that pangolins lack two virus-sensing genes, which may help them tolerate the coronavirus. Understanding this evolutionary advantage could lead to new treatment options for COVID-19 in humans.
A stranded seal was found with multiple facial wounds inflicted by fish, which researchers attribute to the animal's attempt to defend itself. The study suggests that similar injuries may be more common than previously thought, highlighting the dangers faced by marine mammals in their quest for food.
The discovery of Adalatherium, a bizarre mammal from Madagascar, sheds light on the evolution of mammals during the time of dinosaurs. Its unique characteristics and preserved 3D structure offer valuable insights into the geography and fauna of the region.
Researchers measured oxygen consumption in wild-caught lesser treeshrews across various temperatures. The study found that Bornean treeshrews have a high upper limit of the thermoneutral zone, contradicting current assumptions.
A new analysis published in Mammal Review suggests natural selection drives size differences between males and females. The study proposes that males and females evolved to differ in size to exploit resources such as food.
Researchers found that ancient horse body sizes shrunk over time due to faster reproduction rates and shorter lifespans. In contrast, big tapir ancestors grew larger as they lived longer and had more resources for reproduction. The study provides new insights into mammal evolution using exceptionally preserved fossils from Germany.