Start from zero

As an outstanding representative of the engraving phenomenon, if pet birds wanted to have relatives, they must be raised from a very young age, and they could not always be kept in cages. The master had to start from the nestling to feed them on behalf of their mother, and play with them in their hands. Through physical contact and language communication, the nestling's impression of the master would be strengthened. Hand-raised birds in this way had more relatives than birds in cages, and they could even be raised indoors like cats and dogs.