I've owned this one since I was a kid but finally got a chance to read it to my 5-year-old. It was a simple but surprisingly powerful story.
A vole named Jeremy is approached by a large bird, the Great Blue Heron, and told to warn the creatures of riverbank about an impending flood.
The problem is, none of them want to believe Jeremy or necessarily believe in a Great Blue Heron. And even when the weather gets worse and the water starts rising, even then Jeremy has trouble convincing his friends and neighbours.
While I could tell my son was slighly upset by how many of Jeremy's friends turn against him, as a story about telling the truth in the face of opposition and disbelief, I thought it was marvellous. I could only hope my kids learn a lesson in character from a character like Jeremy.
Now out of print, I believe.