Oh! So there were actually four Augureys there, and they had been invisible! Vivian watched the four birds with eager eyes, but secretly hoped the four of them didn't start crying or singing any moment now. As much as she tried not to believe what some textbooks would say about certain creatures, the prefect wanted to be sure about it instead. So yes, Augureys, there will be no singing in the total duration of this class, please and thank you.

As for the question, Vivian tried imagining herself as one of the birds. What would cause her to cry? Why would she cry, in the first place? The first thought that fell into her head was to prank humans, which would have been funny. Honestly, she technically would do that, but she wasn't going to say that out loud. Instead, she raised her hand to share a more logical reason. "I think it could be useful for other things, Professor, like when someone or a different creature enters their territory, their cries would alert them to back off." Right?