Difference between revisions of "Category:Birds"

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Birds (class Aves) are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates. 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. Birds have more or less developed wings; the only species without wings was the moa, which is generally considered to have become extinct in the 16th century. Wings are evolved forelimbs, and most bird species can fly. Flightless birds include ratites, penguins, and diverse endemic island species. Some species of birds, particularly penguins and members of the duck family, are adapted for swimming. Birds also have digestive and respiratory systems that are uniquely adapted for flight. Some birds, especially corvids and parrots, are among the most intelligent animals; several bird species make and use tools, and many social species pass on knowledge across generations, which is considered a form of culture.
Birds, classified as Aves, are warm-blooded, feathered creatures with two legs and wings. They lay hard-shelled eggs and possess unique characteristics such as a beak without teeth, a high metabolic rate, a four-chambered heart, and a lightweight yet robust skeleton. While most bird species have developed wings and the ability to fly, there are flightless birds like ratites, penguins, and certain species found on isolated islands. Some birds, such as penguins and certain ducks, have adapted for swimming. Birds have specialized digestive and respiratory systems tailored for flight. Certain species, including corvids and parrots, exhibit remarkable intelligence, tool usage, and cultural transmission of knowledge across generations.


Many species annually migrate great distances. Birds are social, communicating with visual signals, calls, and songs, and participating in such social behaviours as 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 polygynous ("many females") or, rarely, polyandrous ("many males") breeding systems. Eggs are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.
Many bird species undertake extensive migrations annually. Birds are social creatures, communicating through visual signals, calls, and songs. They engage in cooperative behaviors like breeding, hunting, flocking, and mobbing predators. The majority of bird species are socially monogamous, typically forming pairs for one breeding season or longer, though lifelong monogamy is rare. Other species exhibit polygynous or polyandrous breeding systems. Birds lay their eggs in nests and provide extended parental care after hatching.


Many species are economically important. Domesticated and undomesticated birds (poultry and game) are important sources of eggs, meat, and feathers. Songbirds, parrots, and other species are popular as pets. Guano (bird excrement) is harvested for use as a fertilizer. Birds prominently figure throughout human culture. About 120–130 species have become extinct due to human activity since the 17th century, and hundreds more before then. Human activity threatens about 1,200 bird species with extinction, though efforts are underway to protect them. Recreational birdwatching is an important part of the ecotourism industry.
With approximately ten thousand living species, Aves stands as the tetrapod class with the greatest diversity. Birds inhabit diverse habitats worldwide, ranging in size from the tiny bee hummingbird (5 cm or 2 in) to the towering ostrich (2.75 m or 9 ft). Fossil evidence suggests that true birds emerged during the Cretaceous period, around 100 million years ago. The scientific consensus supports the notion that birds are descendants of theropod dinosaurs.
 
Birds hold significant economic importance. Domesticated and wild birds, such as poultry and game, serve as valuable sources of eggs, meat, and feathers. Many people keep songbirds, parrots, and other bird species as pets. Guano, the excrement of birds, is harvested for its use as a fertilizer. Birds also hold cultural significance and have been represented in various human traditions and arts. Unfortunately, human activities have led to the extinction of numerous bird species, with many more currently at risk. Conservation efforts are underway to protect endangered bird species. Birdwatching is a popular recreational activity and an important component of ecotourism.


Aves ranks as the tetrapod class with the most living species, approximately ten thousand. Birds live worldwide and ranging in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. The fossil record indicates that true birds first appeared during the Cretaceous period, around 100 million years ago. The current scientific consensus is that birds are theropod dinosaurs.
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Latest revision as of 05:12, 3 June 2023

Birds, classified as Aves, are warm-blooded, feathered creatures with two legs and wings. They lay hard-shelled eggs and possess unique characteristics such as a beak without teeth, a high metabolic rate, a four-chambered heart, and a lightweight yet robust skeleton. While most bird species have developed wings and the ability to fly, there are flightless birds like ratites, penguins, and certain species found on isolated islands. Some birds, such as penguins and certain ducks, have adapted for swimming. Birds have specialized digestive and respiratory systems tailored for flight. Certain species, including corvids and parrots, exhibit remarkable intelligence, tool usage, and cultural transmission of knowledge across generations.

Many bird species undertake extensive migrations annually. Birds are social creatures, communicating through visual signals, calls, and songs. They engage in cooperative behaviors like breeding, hunting, flocking, and mobbing predators. The majority of bird species are socially monogamous, typically forming pairs for one breeding season or longer, though lifelong monogamy is rare. Other species exhibit polygynous or polyandrous breeding systems. Birds lay their eggs in nests and provide extended parental care after hatching.

With approximately ten thousand living species, Aves stands as the tetrapod class with the greatest diversity. Birds inhabit diverse habitats worldwide, ranging in size from the tiny bee hummingbird (5 cm or 2 in) to the towering ostrich (2.75 m or 9 ft). Fossil evidence suggests that true birds emerged during the Cretaceous period, around 100 million years ago. The scientific consensus supports the notion that birds are descendants of theropod dinosaurs.

Birds hold significant economic importance. Domesticated and wild birds, such as poultry and game, serve as valuable sources of eggs, meat, and feathers. Many people keep songbirds, parrots, and other bird species as pets. Guano, the excrement of birds, is harvested for its use as a fertilizer. Birds also hold cultural significance and have been represented in various human traditions and arts. Unfortunately, human activities have led to the extinction of numerous bird species, with many more currently at risk. Conservation efforts are underway to protect endangered bird species. Birdwatching is a popular recreational activity and an important component of ecotourism.

Birds of The Philippines
Birds of Zamboanga

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