<p>2020.9.22</p><p>2a U5 two little black birds</p><p>拓展各種鳥（上）</p><p>在wiki上搜集了一些容易理解的內(nèi)容，又在youtube找到了一些兒童科普視頻，邊看邊講邊討論。</p> <p>1.wookpecker</p><p><br></p> <ul><li>where to live</li></ul><p>Most species live in forests or woodland habitats.</p><p>Members of this family are chiefly known for their characteristic .</p><ul><li>food</li></ul><p>They mostly forage for insect prey on the trunks and branches of trees, and often communicate by drumming with their beak, producing a reverberatory sound that can be heard at some distance. Some species vary their diet with fruits, birds' eggs, small animals, and tree sap, human scraps, and carrion. </p><ul><li>nest</li></ul><p>They mostly nest and roost in holes that they excavate in tree trunks, and their abandoned holes are of importance to other cavity-nesting birds. They sometimes come into conflict with humans when they make holes in buildings or feed on fruit crops, but perform a useful service by their removal of insect pests on trees.</p><ul><li>bill and tongue</li></ul><p>Woodpeckers have strong bills for drilling and drumming on trees, and long sticky tongues for extracting food (insects and larvae).[2] Woodpecker bills are typically longer, sharper and stronger .</p> <p>2. stork(鸛)</p><ul><li>deion</li></ul><p>Storks are large birds with long legs, necks, and bills. They are wading birds, which means they typically walk or stand in shallow water while feeding. There are 17 species, or types, of stork. The most famous type is the white stork. In some European countries it is said to bring good luck. Storks are related to herons, ibises, flamingos, and New World vultures.</p><ul><li>where to live</li></ul><p>Most storks live in warm regions in Africa, Asia, and Europe. They can also be found in the Americas and Australia. The only stork commonly seen in the United States is the wood stork. It breeds in the Southeast and sometimes wanders farther north. Storks tend to live near water, but they can also be found on dry ground. The white stork is known for nesting on rooftops and chimneys in towns.</p><p><br></p><p>Storks usually stand about 2 to 5 feet (0.6 to 1.5 meters) tall. The largest stork is the marabou of Africa. Storks commonly have black and white feathers. Some species have no feathers on the head and neck, only red, pink, or black skin.</p><p>Most storks eat insects, frogs, fish, and other small animals. They catch their food in fields or shallow waters. The marabou and a type called the adjutant stork feed on carrion, or dead animals.</p><ul><li>symbolization</li></ul><p>The stories about storks bringing good luck have led many people to treat the birds well. In some places, however, storks have been hunted and killed for food or for their feathers.</p> <ul><li>handcraft</li></ul> <p>3.dove</p><p><br></p><p>Columbidae is a bird family consisting of pigeons and doves. It is the only family in the order Columbiformes. These are stout-bodied birds with short necks, and short slender bills that in some species feature fleshy ceres. They primarily feed on seeds, fruits, and plants. </p><p>In English, the smaller species tend to be called "doves" and the larger ones "pigeons".[</p><p>Doves and pigeons build relatively flimsy nests, often using sticks and other debris, which may be placed on branches of trees, on ledges, or on the ground, depending on species. They lay one or (usually) two white eggs at a time, and both parents care for the young, which leave the nest after 25–32 days. </p><p>Unlike most birds, both sexes of doves and pigeons produce "crop milk" to feed to their young, secreted by a sloughing of fluid-filled cells from the lining of the crop.</p> <p>4.swan</p><p><br></p><p>Swans are the largest extant members of the waterfowl family Anatidae, and are among the largest flying birds. The largest species, including the mute swan, trumpeter swan, and whooper swan, can reach a length of over 1.5 m (59 in) and weigh over 15 kg (33 lb). Their wingspans can be over 3.1 m (10 ft).[10] Compared to the closely related geese, they are much larger and have proportionally larger feet and necks.</p><p>Swans feed in water and on land. They are almost entirely herbivorous, although they may eat small amounts of aquatic animals. In the water, food is obtained by up-ending or dabbling, and their diet is composed of the roots, tubers, stems and leaves of aquatic and submerged plants.</p>