The Heron and the Crane

The Heron and the Crane (, "Tsaplya i zhuravl") is a 1974 10-minute Soviet/Russian animated film directed by Yuri Norstein and produced by the Soyuzmultfilm.
Summary.
Based on the folk tale about the unlucky never-ending courtship of the title characters (a male crane and a female heron, each changing their own minds).