What kind of group would be dedicated to supporting a single issue like wildlife preservation?

The kind of group the question asks about are environmentalists who may have distinct groups of wildlife they seek to preserve and save from extinction. For example, as nations such as Japan still hunt whales, there are Greenpeace groups and others dedicated to preserving whales. In Africa, elephants lions and other wildlife are endangered by poachers who illegally hunt in preservations created by forward thinking governments like in Kenya who are aware of the value of preventing extinction of natural wildlife, including gorillas. In Canada, the slaying of baby seals has created a group dedicated to stop this type of hunting. In the US, the Buffalo were preserved by governmental action. Even dogs and cats are trying to be protected by groups such as the ASPCA.