Nature

We have a secret, just we three. The robin, and I, and the cherry tree. The bird told the tree, and the tree told me, and nobody knows it but just us three.

But the robin knows best. Because built the.... I shan't tell the rest. And laid the four little.... something in it.... I'm afraid I shall tell it every minute.

But if the tree, and the robin don't peep, I'll try my best the secret to keep. Though I know when the little birds fly about. The whole secret will be out.