How high the gray swallows can fly

Gray swallows generally can only fly a height of more than ten meters.This bird has nothing to do with the swallow. Its scientific name should be in South Africa's gray silk, a kind of silk bird, and the flight ability is still good.Artificial breeding of this bird is generally used as bird ornamental, not as a bird.It is usually closed in the cage. In order to prevent it from flying away, some flying feathers can also be cut off.