Why do you use small creatures in your books most of the time?

When I was a small boy, my father would take me on walks across meadows and through woods. He would lift a stone or peel back the bark of a tree and show me the living things that scurried about. He’d tell me about the life cycles of this or that small creature and then he would carefully put the little creature back into its home. I think in my books I honor my father by writing about small living things. And in a way I recapture those happy times.