A humane society is a group that aims to stop human or animal suffering
Yes I've heard of it. They do great things for animals.
They are a group that stop human cruelty towards animals and humans
Yes I know. What kinds of things do they do for animals?
In most countries the are used mostly for the prevention of cruelty to animals
Don't they offer services to the public like spays and neuters? 
In the United Kingdom they provide waterways rescue and saving human life