The school owls swooped into the Great Hall carrying the mail as usual, and Neville choked as a huge barn owl landed in front of him, a scarlet envelope clutched in its beak. Harry and Ron, who were sitting opposite him, recognized the letter as a Howler at once ¡ª Ron had got one from his mother the year before.
It looked like the end of Ron and Hermione's friendship. Each was so angry with the other that Harry couldn't see how they'd ever make up.
He followed Lupin into his office. In the corner stood a very large tank of water. A sickly green creature with sharp little horns had its face pressed against the glass, pulling faces and flexing its long, spindly fingers.