Yours Sincerely, Giraffe

In this book about friendship and the distinctions of living in different parts of the world, a giraffe that lives in Africa meets a pelican who's a mailman. Since the giraffe is bored, she sends a letter to the first animal the pelican can find on the other side of the horizon. The letter passes on to a seal who gives it to a penguin. He reads the letter and even though he doesn't understand it he writes back, and becomes the giraffe's pen pal.