Little bear in the big city: Children's book

Little Bear and Mama Bear live happily in the wildlife park. One day, Little Bear comes across a tall, gray wall. Curious about what lies beyond, he sets out with Mama Bear to visit the big city, discovering a very different world - one he cannot understand.
Little Bear in the Big City is a fable with a moral that offers a fresh look, from Little Bear's perspective, at human society.