At dusk, a black "swallow" flew into the cell and landed on Shangguan Xuanyi's shoulder.
This was one of the "swallows" Shangguan Xuanyi released this morning.
The two birds that Shangguan Xuanyi released, which resembled swallows, were messenger crows raised by Xiao'er in her spatial realm.
Messenger crow was a name Xiao'er came up with. They could be considered mutant crows, as their tails slightly resembled scissors. When they flew in the sky, they could easily be mistaken for swallows, but they were essentially crows.
Crows were the smartest birds on earth, with very high intelligence. And the crows raised in the spatial realm were even smarter and craftier.
Xiao'er thought it was a waste not to make full use of the intelligence of the crows.
With time on her hands, she taught them to carry messages like homing pigeons. Actually, it was more like communicating her thoughts with them in the spatial realm. And to Xiao'er's delight, the crows truly understood.