As you probably know, Harry couldn't see the thestrals in the earlier books. The reason he could see it in later years is because the death you had to witness must sink in.
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Fun Facts About the Harry Potter Series
Random(Idea from AangTheAvatar) Here are some things you probably didn't know about Harry Potter! Cover by the fabulous @Supernatural_Bish
Fact #34
As you probably know, Harry couldn't see the thestrals in the earlier books. The reason he could see it in later years is because the death you had to witness must sink in.
