Dementors and Muggles

[Sylph ~*~]

No: HPFGUIDX 22126

I was reading PoA last night, and two questions came about my mind.

1) Dementors
Inside the books, we learn that dementors are blind, they can't see. 
However, they CAN sense happiness and life-force. That's how Sirius and 
Crouch escaped from Azkaban. If this is true, then how were the Dementors 
supposed to guard Hogwarts? How can they tell the students apart from 
Sirius? And if anyone can answer that, here's a nother question: We never 
hear the dementors talk, or give any signal that they listen or understand 
wizards. Well then, how would the Ministry direct dementors--or stop them 
from--performing the Kiss?

2)Muggles and Magic
Even though Muggles feel them [Dementors], although they can't see them. 
Well, if this is true, why did the wizards have to hide their magical 
creatures? Dementors are definitely magical, and they say Muggles can't see 
them. So why must they somehow hide hinkypunks, grindylows, 
manticores,pixies? I'm not sure where I read this--the Magical Dreatures 
'textbook'?--but it was somewhere that said the wizards had to go into 
hiding and take all the magical creatures with them. What's the point, if 
Muggles don't notice them anyhow? I mean, yes, the Muggles noticed the 
unicorns, dragons, fairies, griffins, and suchlike, but perhaps it's only 
certain creatures?

Erm, I really hope I made sense during this post.

Sylph
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