Teaching is closely related to learning, the student's activity of appropriating this knowledge.
[2][3] A teacher, also called a schoolteacher or formally an educator, is a person who helps students to acquire knowledge, competence, or virtue, via the practice of teaching.
Indeed, in psychology, teaching is defined by the intention of the teacher, which is to transmit information and/or behavior and/or skill.
This implies the need for the teacher to assess the knowledge state of the potential learner, thus to demonstrate theory of mind abilities.
As theory of mind and intentions are difficult (if not impossible) to assess in non-humans, teaching was considered uniquely human.