Zhenya had followed Professor Bentley, half between a brisk walk, half between a run, and she stopped. She restrained herself from hunching forward whilst she got her breath back properly. But, she made it. She looked up to see what they could possibly be studying in relation to ecosystems in the castle. Surely they weren't looking at the Hogwarts Castle ecosystem. What, with the students and their predators, the Professors, and all the walls and food and elves.

But it all made sense! There was something on the floor. It was... what was it? A swamp? River? Lake? No, must be a swamp. It had a smell.

She looked at Professor Bentley and said "This is cool, Professor."