Ruby, the last of Mother Duck's and Father Duck's eggs to hatch, is slower to develop than her four siblings, until the day that she flies farther and higher than any of them.
"Una patita no nada ni come somo sus hermanos. Papá Pato está perocupado, pero Mamá Pata sabe que todos los patitos son diferentes y qye la patita ya crecerá... a su tiempo"--Cover, P. [4].
Ruby, the smallest of five duckling siblings, always lags behind until they get lost in a storm and Ruby uses her powers of observation to try to save them.