The Heron and the Crane

Once upon a time, a heron and a crane lived at opposite ends of a swamp. One day, Crane realises he is lonely, and decides it's high time he got married, and it seems obvious to him that he should ask Heron to be his wife. So, after grooming himself very carefully, he crosses the swamp to propose. But life is never simple and proposing turns out to be more difficult than Crane could ever have imagined...