Polar bear postman

Milk is the polar bear postmaster of the forest. One day he receives a card that says "Please help!" It is from a red-crested crane couple whose chick has gone missing. Spring gives way to summer and Milk receives another post card--this time from a red-crested crane couple who live in another district telling him that they have been taking care of a lost crane chick and asking for help in finding its family.--Publisher.