Éanacha mara ag feathered, winged, bipedal, inteirmeach (te-blooded), ubh-leagan, ainmhithe veirteabracha. le thart 10,000 speiceas beo, tá siad an rang is speciose na veirteabraigh tetrapod. Mbaineann gach speiceas i láthair leis na Neornithes fho-aicme, agus éiceachórais ar fud na cruinne maireann, ón Artach go dtí an Antartach. Extant birds range in size from the 5 cm (2 i) Bee Hummingbird to the 2.75 m (9 ft) ostrich. The fossil record indicates that birds emerged within theropod dinosaurs during the Jurassic period, thart 150 million years ago.
BARR 12 IS Grianghraif BIRD álainn :
BLUE BIRD OF PARADISE
BEAUTIFUL BLUE PARROT
AWESOMELY COLORED BIRD OF PARADISE
HUMMING BIRD IN ACTION
BIRD OF PARADISE
AUSTRALIAN KING PARROT
SPRING SEASON BIRD
BLUE BIRD ON A TREE TRUNK
BEAUTIFUL YELLOW PARROT
GREEN PARROTS OF MADGASCAR
Modern birds are characterized 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 living species of birds have wings; the most recent 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 a number of diverse endemic island species.
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