Legend about why sparrows jump and walk.

Legend about why sparrows jump and walk;

A long time ago, sparrows' feet were not as small as they are now, but walked with exchanged legs like other birds. But the boldness and cleverness of sparrows make them often appear in groups, which makes the local people very uncomfortable. Because they always steal crops, even in dry years, when seeds are people's rations, the harm of sparrows is even more serious.

One year, there was no rain, crops were hopeless and people were hungry. They tried to pray to heaven to save the Lebanese people and offer tributes. However, the hungry sparrow found these tributes and rushed in. People tried to drive away, but they couldn't catch these flexible sparrows.

God in heaven saw all this and felt deep sympathy in his heart. So God decided to punish sparrows with fetters. They quietly lengthened the length of the fetters, so that the sparrows could only hop away. From then on, sparrows can only jump and walk, because their wings become smaller and they can't fly high.

This legendary story expresses the wit and flexibility of sparrows, but it also reveals their harm to human production and life.

popular science knowledge

In fact, sparrows don't jump. They actually jump forward with their feet together. Sparrows have short hind legs, consisting of thighs, leg bones, tarsal bones and toes. The muscles of the whole hind leg are distributed in the thigh and gaskin, and the other parts are tendons. These tendons run through the toes, which can control the bending of the toes and enable sparrows to grasp the branches and live safely.

However, there is no joint mortar between Gaskin tarsal bone and tarsal phalange of sparrow's hind limbs, which makes the joint between their tibia and tarsal bone unable to bend. Tendons can bend sparrows' legs and feet, but they can't turn sparrows' joints.