Animals just want to have fun in an array of fall titles. The first, Birthday Zoo by Deborah Lee Rose, illus. by Lynn Munsinger, follows an assortment of animals as they get the party started for one lucky kid ("" `Who is it for?' inquired the boar. `Kid with the presents,' answered the pheasants""). Happily chaotic illustrations create a festive mood (a final painting reveals the guests as stuffed toys).