"Actually, I had gone out and gotten a batch of frogs for the students. Mostly because frogs are harder to change than some other animals because they're always jumping around, and I wanted them all to experience it." Seamus wanted to make sure his students were all having a fair shot at changing certain things, and he really didn't want them losing personal pets."
And Merlin, Neville would've talked about it till the day they left Hogwarts. "Aye, he stayed in tonight. I told him that while I don't mind covering for him, I need me time as well. I thought I was going to be home most weekends, but his sudden gain of a love life has taken a toll on me spending time with you," he said frankly.