Myshonok Pik (1978)

The tiny field mouse was noticed by the children playing on the banks of the river. The boy wanted to throw him into the water, but his sister defended a furry animal. The guys put him on the boat and he went to the sea. So began the adventures of little mouse Pik. There were many dangers ahead of him, at first he had to flee from the gulls, which overturned the boat. Mouse was swimming to the shore, it turns out, he knows how to swim. Now he needs to learn to look for food, hide from enemies, build a house for himself.