…birds and mammals, capillaries in heart muscle occupy about ten times more space than tracheoles do in insect flight muscle. “By comparison, capillaries in the cardiac muscle of birds and…
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…a group that includes reptiles, birds, mammals, and their shared ancestors, some of the first animals to fully adapt to life on land. Ancient Fossil Reveals Early Breathing System In…
…a deformation; it’s just the way the animal was made.” Tanyka belongs to a broader group known as tetrapods, which are four-limbed vertebrates that include reptiles, birds, mammals, and amphibians….
An artist’s interpretation of a juvenile Doolysaurus huhmini. It is depicted alongside birds and non-avian dinosaurs that lived during the Cretaceous in what is now South Korea. Credit: Jun Seong…
…also reshaped views of animal communication. Dolphins use distinctive signature whistles, birds produce songs with syntax-like organization, and apes communicate intentionally through context-sensitive gestures. At the same time, the emergence…
…help explain how modern birds and fish developed the ability to orient themselves using the Earth’s magnetic field over long distances. The evidence comes from microscopic magnetic fossils that are…
Bird flu has been quietly spreading in the U.S. for over a decade, jumping from birds to farm animals and even infecting people — a warning sign that it could…
…toward humans. Along Brazil’s coast, the Atlantic Forest packs remarkable biodiversity into a shrinking strip of habitat, with birds, amphibians, reptiles, mammals, and fishes found nowhere else. But as development…
…likely left many birds unable to build the energy reserves they need to survive this vulnerable stage. On two key breeding sites for the African penguin (Spheniscus demersus) — Dassen…
…12,000 species—surpassing both birds and mammals. This remarkable success raises questions about which characteristics enabled their evolutionary advantage. Paleontologists long assumed that the earliest lepidosaurs would already display key lizard-like…
…diets can include birds, bats, rodents, newts, snakes, and turtles. Credit: National Park Service Where bullfrogs were present, only older, large turtles — too big to fit in bullfrogs’ mouths…
…stay in one place. Within the species, two strategies exist. Some birds remain in the Camargue throughout their lives (they are known as ‘residents’), while others undertake annual journeys around…
…male chromosomes are exposed to high incubation temperatures, the hatchlings can develop into fully functional females. Unraveling the Z and W Chromosomes Like many reptiles and birds, bearded dragons use…
…linked to key developments in how these animals eat and breathe. “Ultimately, it’s even more similar to cartilaginous fish [sharks, rays, and chimaeras] and tetrapods [birds, mammals, amphibians, and reptiles]…
…thrown off, putting both biodiversity and ecosystem health at risk. “Under normal conditions, lagoons act as nurseries for fish and crustaceans, they are internationally important feeding grounds for migratory birds,…
…evidence of the large terrestrial predators. In their absence, smaller endemic predators like birds, snakes, and crocodiles have evolved to fill the gap in the food chain. “You wouldn’t have…
…drew attention to the reproductive harm it caused in birds, most notably the bald eagle, and inspired widespread environmental action. Sixty years later, researchers at Rutgers University-New Brunswick are studying…
…and beauty. They play important roles in cycling nutrients and are a significant food source for other organisms such as birds. Over the last 50 years, North America has lost…