Rodent knowledge

Girl on phone, in the hallway: "You don't know what a gerbil is?"

small furry rodents

Girl: "Isn't it wonderful to have a small furry rodent in your hand?"
and: "He's really smart and he's really strong. That's a bad combination in a gerbil."

Beastly Body Image

At the pet shop. Small girl with her parents.
Mother: "How about this gerbil? Should we get this one?"
Girl: "No, his butt sticks out too much."