Yes.,
Owls
We know that at least 5 different breeds of owls are sold at Eeylops Owl Emporium - Barn Owl, Brown Owl, Screech Owl, Snowy Owl and Tawny Owl. There are almost certainly more sold there, but the species are unknown.
No, owls are the most popular choice.
The owls are used like carrier pigeons. They deliver letters/packages and are kept as pets.
Digitalis is not a spell in Harry Potter.
Lacock Abbey was used for some scenes as Hogwarts in Harry Potter.
no
Harry Potter attempted to use crucio on Bellatrix Lastrange and later used it on Amycus Carrow.
Rodents, Louis 'Bozzy la' Rodents, Louis 'Bozzy la'
no
yes
Professor Quirrel (Harry Potter 1). Also, his voice was used (modified) for Lord Voldemort.