Hermione had to force herself to remember what they were.  Small birds, related to sparrows, could briefly enchant anyone who was within range including, oddly enough, people otherwise wholly deaf.  Their range was small, though, and the effect didn't last long.  She wished Hagrid had included more things like siren sparrows in Care of Magical Creatures and fewer things like those awful blast-ended skrewts.  She pictured a class all too stubborn to wear ear protection, all falling under the birds" spell.  The man at her side would have surely been one of the sort who refused to take precautions and that meant his cronies wouldn't have either.  The thought of a whole class filled with dazed Slytherins made her smile until she remembered he hadn't brought the bird into Harry's townhouse.  "What happened to it?" she asked.  Then, "Where did you get it."