Anonymous asked: Hi - i have something i have always wondered about. It has plagues me all through my HP life. How come Harry can't see the thestrals when he first comes to Hogwarts? By seing his mothers murder, shouldn't he have been able to see them from the very beginning and not just after Cedrics death?

Jo has said that thestrals are only visible to those who have witnessed death and have been able to process it. Harry was only an infant when he saw his mother die and therefore couldn’t mentally process what he was witnessing. Only when he was a fourteen-year-old witnessing the murder of a fellow student right in front of him could he fully process the concept of death and what was happening before him, allowing him to see thestrals pulling the carriages when he returned to school the following September.