Pixie wasn't the sort of person to get involved in causes. It wasn't that she didn't care, just that she always seemed to have something else to do, be it hanging out with friends or failing to get her homework handed in on time. This sounded interesting though, so she listened to the younger girl, frowning slightly. This was all new to her. She'd heard people saying that house elves should all be set free and knew there had been a club for that started in Gryffindor some years ago, but the idea of animals suffering...made sense.
"You mean like when we learn to vanish mice in class?" she asked, oblivious to the fact that second years weren't doing anything so complex yet "I never thought...I just figured they..." she trailed off, not wanting to say I just figured they didn't mind because the truth was, she'd literally never considered it before. They were just mice, and they just got used where they were needed. Wand cores she couldn't quite figure out - after all, unicorn tail hairs and phoenix feathers didn't hurt the creatures at all - but potions ingredients, on the other hand, she understood.
"What would we use instead of those potion ingredients, though? Would we need to invent new potions?" she asked, not sounding argumentative but merely curious. Pixie knew some charms had been in use for hundreds of years with little modification simply because they worked so well, potions were probably similar. Who would invent the new potions that didn't use anmal ingredients? Would they be vegetarian potions, the? She giggled a little at that thought and turned her attention back to the posters.
"Sure, maybe a little lower so people can read it as they go past?" she suggested as she held the poster up against the wall with her wand "and maybe we should levitate one so it hangs above the foot of the stairs - actually that might be difficult, I don't always get the permament unfurling charm right so it would probably just curl up again after a little while." Pixie assumed that the younger girl, even though she was a Ravenclaw, wouldn't be able to perform a charm that a fourth year struggled with.
"Okay, I think that's even, if you want to do the sticking charm" she said after a moment.