Answer:
The animals take up a lot of room within the speaker, but there is room for other forces too. He has the heart of a man and a woman, he is a father, a mother, and a lover, everything that he considers himself to be “came from God-Knows-Where” and is going to "God-Knows-Where". No matter where this speaker is going, he takes comfort in the forces within him. He knows that he is the “keeper” of the zoo and must remain dedicated to the power of the “wilderness” from which he came.