Astringofcomicallystylizedanimalsgreeteachotherinmasterfullyrhymingcouplets—anowl's“hoo”isansweredbyacow's“moo”;acrow's“caw”isreturnedwithadonkey's“hee-haw”—allleadinguptothe“hi!”and“good-bye!”ofahumantoddlerandhismom!Thefirstinabrand-newboardbookseriesonanimal(andhuman)firstwordsbyaward-winningauthorandillustratorEthanLong.