How long does a baby horse have to grow inside its mother before it is born? . . How much does it cost to keep a horse? . . How do horses communicate with each other? . . Did American Indians always ride horses?"" Selsam's question and answer format makes her book attractive to new or reluctant readers, especially the reality-oriented among them who have no use for Anderson, Henry, et al., and yet within this structure she manages to cover the horses's evolution from eohippis and the origin and qualities of eight special breeds along with the seeming incidentals quoted above. Lee's soft brown and green water colors take up at least half of each double page, which adds to the browsable appearance.