1. Flowers wither and red apricots are small. Swallows fly, green water people go around. -Su Shi's Spring Scene in Hua Lian.
2. Mud melts into swallows, while sand warms the sleeping mandarin ducks. -Du Fu's "Jueju, Red Sun Jiang Li Shan"
3. stuffed with honey and spleen, drizzled with fragrant mud. -Lu Zhi's "Double Tone, Intoxicated by the East Wind, Chun Qing"
4. Fish comes out in the drizzle, and Yan is inclined in the breeze. -Du Fu's "Two Hearts and Water Threshold"
5. Don't miss the romance, collapse the restaurant, burn down the tea shop and Liu Ying flower market, and even call the swallows and warblers! -Zhang Kejiu's "Xiaoliangzhou, Windy Window"
6. Swallows come to the news agency, and pears come after Qingming. -Yan Shu's "Broken Yan Lai Xinshe"
7. Swallows bring wine to get sick, peonies write poems, and the courtyard is yellow and rainy. -Zhang Kejiu's "Hong Xiuxie Er Yun Jian Xi Lai"
8. After Begonia bloom, the pear blossoms rained and the swallows were empty. -Zhang Kejiu's "Man, Moon and Spring Rhyme"
9. Yanzilou is a cold food. The moon shines on the lovesickness bed in the sky, and it still dances feebly in a dress. ? -Mao Kun's "Joke, who fights for pity outside the play"
10. Red apricots are cold and rainy. Swallows are muddy and can't stop flying. -Mao Kun "Dead Hua Lian Cold Food"
Swallow introduction:
Swallow is a general term for 74 species of passeriformes. Small size, narrow wing tip, short beak and concave tail, weak feet and few feathers. Feathers are monochromatic, blue or green, with metallic luster; Most kinds of men and women are very similar.
Swallows spend a lot of time catching pests in the air. It is one of the most flexible birds, mainly feeding on insects such as mosquitoes and flies, and is a well-known beneficial bird. Nest in tree holes or cracks, or make holes in sand dikes, or stick mud on walls or protrusions of corridors, roofs, eaves, etc. In urban and rural areas. Each lays 3 ~ 7 eggs.
A slender body can reduce the resistance when flying. Swallow's wing shape has a high aspect ratio, which means that it can produce great lift and little resistance. However, this aerodynamic efficiency is at the cost of reducing maneuverability (for example, compared with short and wide wings), but this disadvantage is partially compensated by the forked tail, because such a tail can improve the maneuverability of birds.