Does the observation of birds and beasts limit the Invisibility Ability? He Kao has conducted many experiments, most of the time it doesn't, but there are cases when it does.
The conclusions he reached are related to the type of animal, the individual animal, and even the state of the same individual.
Some animals can, some cannot; even within the same species, like dogs, some dogs can, while many dogs cannot; and even the same dog may sometimes be able, sometimes not.
He Kao originally could not fly and didn't have much interaction with birds. He tested with wild animals in the mountains, but he experimented most with dogs because they are common both in the countryside and the city.
What kind of dogs can achieve it? Firstly, of course, those particularly intelligent dogs, but this concept is too vague. He Kao later gradually determined they were the ones who could recognize him.
