The descriptions are haunting.
The descriptions are haunting.
The explanation for how people learn complex behaviors, such as speech, might be found in a new study of songbirds by scientists at the USC Dornsife College of Letters, Arts and Sciences.
Why do some sparrows hatch six chicks while others don't hatch any? How does upbringing affect the remainder of their lives? Physiological stress in the nest can actually affect birds' DNA and possibly their lifespan.
Myanmar health authorities have asked the UN's health agency for help to combat a deadly outbreak of swine flu that has sparked alarm in the commercial capital.
"Yarraman flu is a virus quickly infecting the U.S. ...." The mock announcement was enough to make readers worry. But when the name of the hypothetical illness was changed to "horse flu", the news elicited a different reaction. ...
University of Hertfordshire researchers have developed a new concept which could lead to the discovery of universal anti-influenza drugs.
The U.S. Centers for Disease Control and Prevention this spring reports that there are eight ongoing outbreaks of salmonella in 47 states linked to backyard poultry in the United States. As of May 13, 71 people had been hospitalized—36 ...
(HealthDay)—A half-century into its run as an iconic staple of children's television, "Sesame Street" will introduce a character with autism to its world-famous neighborhood.
President Trump proposed a US$54 billion military budget increase to solidify the security of our nation. However, the government also recognizes pandemic threats as an issue of national security – one that knows no borders.
Nine people have died of bird flu in China this year, state media reported Wednesday, after the World Health Organization (WHO) urged all countries to promptly report human infections.
About two dozen - see section below
Birds (class Aves) are winged, bipedal, endothermic (warm-blooded), vertebrate animals that lay eggs. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.7 m (8 ft 10 in) Ostrich. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic period, around 150–200 Ma (million years ago), and the earliest known bird is the Late Jurassic Archaeopteryx, c 155–150 Ma. Most paleontologists regard birds as the only clade of dinosaurs that survived the Cretaceous–Tertiary extinction event approximately 65.5 Ma.
Modern birds are characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All birds have forelimbs modified as wings and most can fly, with some exceptions including ratites, penguins, and a number of diverse endemic island species. Birds also have unique digestive and respiratory systems that are highly adapted for flight. Some birds, especially corvids and parrots, are among the most intelligent animal species; a number of bird species have been observed manufacturing and using tools, and many social species exhibit cultural transmission of knowledge across generations.
Many species undertake long distance annual migrations, and many more perform shorter irregular movements. Birds are social; they communicate using visual signals and through calls and songs, and participate in social behaviours including cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially monogamous, usually for one breeding season at a time, sometimes for years, but rarely for life. Other species have breeding systems that are polygynous ("many females") or, rarely, polyandrous ("many males"). Eggs are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.
Many species are of economic importance, mostly as sources of food acquired through hunting or farming. Some species, particularly songbirds and parrots, are popular as pets. Other uses include the harvesting of guano (droppings) for use as a fertiliser. Birds figure prominently in all aspects of human culture from religion to poetry to popular music. About 120–130 species have become extinct as a result of human activity since the 17th century, and hundreds more before then. Currently about 1,200 species of birds are threatened with extinction by human activities, though efforts are underway to protect them.
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