Sally's family doesn't believe her when she says there's a hippo in the yard--but that's not the only surprise in this Level F book for emerging readers. "I don't think so, dear," says her mom. So Sally just takes some lettuce to feed the hungry hippo. Dad doesn't believe her about the tiger, and Nana won't put down her knitting to go see the koalas in the hammock. Lively illustrations by The New Yorker cartoonist Liza...