We see how the Creator takes care of all their needs even though they do nothing to serve Him in return. They adapt well to the natural environment and do not pollute it. They also function in ways that collectively enhance the outside environment. Thus, a balance is maintained with the gases in the atmosphere. In return the plants provide us and the animals with carbon as food.
Worms help till the soil, and insects and flies eat up harmful bacteria.
Animals of prey will keep the population of insects and pests from getting out of hand. Bacteria themselves and fungi are useful to break apart refuse and garbage and convert them back into soil. All of these creations that G-d made follow exactly what He designed them for. They posses no inclination to do anything more or less than that. Animals may have their own desires and instincts, but they have no sense of intuition to do good.