1. They are hunted for food in some places.
Does it mean they hunt chimps for eating(to eat)? Well, I guess so.
Or...does it mean "They are hunted and sold away to get food they need to live"??(Well...I don't think so.)
2.we must never let them come to harm at our hands.
I'm not really sure what it means...Could anybody put it in another way?
To put it very simply. We must never hurt them/cause them harm.