20點~~搵人幫幫~~任何bird簡介(英文)

Birds (class Aves) are bipedal, warm-blooded, egg-laying vertebrate animals. Birds evolved from theropod dinosaurs during the Jurassic period, and the earliest known bird is the Late Jurassic Archaeopteryx. Ranging in size from tiny hummingbirds to the huge Ostrich and Emu, there are around 10,000 known living bird species in the world, making them the most diverse class of terrestrial vertebrates.
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, though the ratites and several others, particularly endemic island species, have also lost the ability to fly. Birds also have unique digestive and respiratory systems that are highly adapted for flight.
Many species of bird undertake long distance annual migrations, and many more perform shorter irregular movements. Birds are social and communicate using visual signals and through calls and song, and participate in social behaviours including cooperative hunting, cooperative breeding, flocking and mobbing of predators. Birds are primarily socially monogamous, with engagement in extra-pair copulations being common in some species - other species have polygamous or polyandrous breeding systems. Eggs are usually laid in a nest and incubated and most birds have an extended period of parental care after hatching.
Birds are economically important to humans: many are important sources of food, acquired either through hunting or farming, they also provide other products. Some species, particularly songbirds and parrots, are popular as pets. Birds figure prominently in all aspects of human culture from religion to poetry and popular music. About 120–130 species have become extinct as a result of human activity since 1600, and hundreds more before this. Currently around 1,200 species of birds are threatened with extinction by human activities and efforts are underway to protect them.

任何bird簡介(英文)
Birds range in size from the tiny hummingbirds to the huge Ostrich and Emu.

The Bee Hummingbird (Mellisuga helenae) is the smallest bird in the world, weighing 1.8 grams. A more typical hummingbird, such as the Rufous Hummingbird (Selasphorus rufus), weighs approximately 3 g and has a length of 10-12 cm (3.5-4 inches). The largest hummingbird is the Giant Hummingbird (Patagona gigas), with some individuals weighing as much as 24 grams.

Ostriches usually weigh from 90 to 130 kg (200 to 285 pounds), although some male ostriches have been recorded with weights of up to 155 kg (340 pounds). At sexual maturity (two to four years old), male ostriches can be between 1.8 m and 2.7 m (6 feet and 9 feet) in height, while female ostriches range from 1.7 m to 2 m (5.5 ft to 6.5 ft). During the first year of life, chicks grow about 25 cm (10 inches) per month. At one year, ostriches weigh around 45 kg (100 pounds).

The Emu, is the largest bird native to Australia and the only extant member of the genus Dromaius. It is also the second-largest bird in the world by height, after its ratite relative, the ostrich. The soft-feathered, brown, flightless birds reach up to 2 m (6 ft 7 in) in height. The largest individuals can reach up to two metres (6 ft 7 in) in height (1–1.3 metres (3.2–4.3 ft) at the shoulder) and weigh between 30 and 45 kilograms (66–100 pounds).
about bird ge文
If I were a bird , I could fly in the sky.

I could sing beautiful songs on a tree.

There is no need for me to study those boring textbooks,and there

is no need to get up early and go to school every morning.

It would be an interesting experience to feed on worms in a garden.I think they

would be very tasty.

On,how I wish I were a bird!

What a wonderful adventure it would be!