What idioms are there to describe swallows?

Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying, Yingying Blue Yan belongs to Yan 'an poison Yan 'an poison Yan 'an poison Yan's burning nest Yan's nest flying screen Yan's nest screen Yan's nest screen Yan's nest screen protection Ying guessed Yan's jealousy Yan's companion Ying's companion Yan's companion Yan's nest was on the screen.