2. The general term for birds of the family Yanidae. Good bird. Small size, long wings, split tail feathers when spreading flat, and preying on insects when flying. It is distributed all over the world. There are 9 species in China, such as Ru Yan, which spread all over the country in summer, nesting under the eaves of buildings and flying south in autumn and winter.
3. Swallows belong to passerine 1 genus. This genus of birds is small in size, with a body length of130 ~180 mm. The wing tip is long and the tail is forked. Most of the feathers on the back are blue-black, so they were called mysterious birds in ancient times. The wing tip is long and good at flying, the mouth is short and weak, and the mouth is wide, which is a typical mouth shape of insect-eating birds. Short feet and strong claws. There are 20 species in the world and 4 species in China, among which domestic swallow and Jin Yan are more common. Swallows are chestnut red in the front waist, with irregular horizontal bands in the back chest and milky white in the abdomen. Swallows usually breed from April to July. Domestic swallows nest under the eaves of farmhouses. The nest is made of saliva bonded with soil and grass stalks, covered with soft weeds, feathers, rags and so on. And some Artemisia annua leaves. The bird's nest is dish-shaped. Breeding 2 nests every year, mostly from May to early June and from mid-June to early July. Each nest lays 4 ~ 6 eggs. The second nest is less, 2 ~ 5 pieces. Eggs are milky white. Males and females hatch eggs together. 14- 15 days, chicks hatch and parents eat together. The chicks fly out in about 20 days, and then feed them for 5 ~ 6 days, so they can feed themselves. The food is full of insects. The golden waist swallow is similar in shape to the domestic swallow, but slightly larger. This swallow has a chestnut waist, which is very eye-catching, and a small black line in the lower body, which is easy to distinguish from domestic swallows. Habits are similar to those of domestic swallows, but most of them live in mountain villages. Yan is a typical migratory bird. After the breeding, the young birds still follow the adult activities, gradually integrate into the large group, and move south for the winter before the first cold wave comes. In addition, this term is also used in Asia to describe systematically trained female agents who carry out secret activities abroad.
4 living habits
Swallows usually breed from April to July. Domestic swallows nest under the eaves of farmhouses. The nest is made of saliva bonded with soil and grass stalks, covered with soft weeds, feathers, rags and so on. And some Artemisia annua leaves. The bird's nest is dish-shaped. Breeding 2 nests every year, mostly from May to early June and from mid-June to early July. Each nest lays 4 ~ 6 eggs. The second nest is less, 2 ~ 5 pieces. Eggs are milky white. Males and females hatch eggs together. 14- 15 days, chicks hatch and parents eat together. The chicks fly out in about 20 days, and then feed them for 5 ~ 6 days, so they can feed themselves. The food is full of insects. The golden waist swallow is similar in shape to the domestic swallow, but slightly larger. This swallow has a chestnut waist, which is very eye-catching, and a small black line in the lower body, which is easy to distinguish from domestic swallows. Habits are similar to those of domestic swallows, but most of them live in mountain villages. Yan is a typical migratory bird. After the breeding, the young birds still follow the adult activities, gradually integrate into the large group, and move south for the winter before the first cold wave comes.
Five basic types
There are many kinds of swallows in China. Only Jin Siyan, Swift with Needle Tail and Swift with White Waist can produce bird's nest. Golden bird's nest is still the most precious, with its thick nest layer, tender and soft, transparent color and rich nutrition, and is known as the first bird's nest. Swallows are divided into Swift, Louyan, Domestic Swallow and Swallow. Different swallows have different living habits. For example, swallows and swifts belong to climbing birds, while domestic swallows and golden swallows belong to songbirds. Different kinds of swallows have different shapes. Lou Yan is bigger, flying high, flying fast, black all over, metallic and singing loudly. It likes to nest under the high eaves of pavilions and ancient buildings. Domestic swallows are small, with metallic black hair, chestnut head, white or light pink abdomen, low flying and low singing. They are mostly on the indoor beams and corner nests of residents, and they like to be close to human beings. They mainly feed on mosquitoes, flies and other insects. They are well-known beneficial birds, and they have the habit of protecting swallows in the mass era. When the autumn wind is bleak and the leaves are falling, swallows fly to the south in droves, and then fly back to the original place when the willow shoots are in bloom the next spring. Yan will come back at this time every year. Swift is the fastest bird. It often preys on insects in the air, with long wings and weak legs. Swifts are widely distributed, often breeding in high latitudes and wintering in tropical areas. There are 80 species belonging to 18 genus and 7 species belonging to 4 genera in China.
According to statistics, there are as many as 75 species of swallows in the world, including Louyan, White-waisted Swift, Domestic Swallow, Swallow, Grey Sand Swallow, Golden-waisted Swallow and Hairy-footed Swallow. Different swallows have different living habits. For example, swallows and swifts belong to climbing birds, while domestic swallows and golden swallows belong to songbirds. Different kinds of swallows have different shapes. Lou Yan is bigger, flying high, flying fast, black all over, metallic and singing loudly. It likes to nest under the high eaves of pavilions and ancient buildings. Domestic swallows are small, with metallic black hair, chestnut head, white or pale pink abdomen, low flying and low singing. They are mostly on indoor beams and corner nests of residents, and they like to be close to human beings. Louyan, White Waist Swift, Family Swallow, Swallow, Grey Shayan and Golden Waist Swallow nest under the mud eaves every spring, and Jin Siyan on the mainland island also begins to spit for the first time. By the late stage of nesting, even the blood was spit out, which felt like "the filariasis in spring will weave until it dies". Therefore, when we collect bird's nest, we often see the situation that the blood in front of the nest turns red. The mother swallow died in the nest because of overwork!
Island and Guangdong Huaiji cigarettes are the main producing areas in Jin Siyan. From June 165438+ 10 to March the following year, groups of Jin Siyan flew to the mainland island to nest. There are more than 100 cliff caves on the mainland island, but Jin Siyan only nests in rock caves about 200 meters high in the southeast. The mouth of the cave is narrow at the top and wide at the bottom, so it cannot enter from the top of the rock. Fishermen who collect bird's nest must sail to the lower end of the cave, then dive into the lower water hole and climb up the cave wall. The bird's nest used to be a huge rock, but later the rock split in two, just like an uncanny workmanship. The gap in the middle is about 40 cm wide and cracks from the water surface to the top of the cliff. After entering the cave for more than 2 meters, the cave gradually widened and the light gradually dimmed. The grotesque rocks in the cave are winding, and seawater comes in from the mouth of the cave and other crevices, hitting the stone wall, crashing and thundering. Some stone walls have been eroded and collapsed after years of weathering, blocking the hole and being impenetrable. Occasionally, a narrow beam of light shoots into the cave from the top of the cave and shines on the seam walls on both sides, so that we can get a glimpse of the bird's nest in this weak light.