Snape DE/spy status (WAS Snape and Redemption

[Sembei Grindelwald]

No: HPFGUIDX 76228

If the theory Snape - Vampire was true, he can spy like a bat.
I believe in the Snape - Vampire theory but what about Snape - Crow?
Lupin said something like "There are three animagus in Hogwarts that 
MOM dont know. I think he was not talking about the marauders. Was 
he?
Another one can be Dumbledore - bee (he don't need a cloak to be 
invisible, ah?)

PD: In Disney's snowhite, a crow spies on the witch while she was 
making the potion ...