Ding Ning was constantly searching in the flower and bird market. What he needed was a pet with intelligence which was small and not easy to attract people's attention.
Shrews was a good choice for Ground tracking work, but by communicating he found that shrews were not intelligential, and very weak in vision, thus not suitable for pets with intelligence.
On the contrary, dog pets were quite spiritual and easy to communicate, but Ding Ning did not want to take another dog as pet with intelligence. After all, dog was big to be targeted at, and it was easy to be detected by the target with strong anti-investigation consciousness.
Aquatic organisms were not considered, and then excluding dogs and rats, so birds became the first choice, such as parrots, larks, thrushes, pigeons, woodpeck
