Save and protect lives!

We protect our machines from damages by providing care to them. Then why should not we protect the other living things that live or exist with us (such as ants etc.)? Remember that we, as humans, are incapable to remake or wake them up from their death done by killing! We should not kill them as far as they do not harm us, and should protect them from being killed as far as possible - without ourselves being harmed or harming ourselves, in the act.