A person, who ignores malnutrition on the rest of the planet, and tries to force his/her own view on others. Often seen protesting medical advances, clothes or food that involved animals in the process. Would rather "convert" people to his/her own beliefs than accomplish something productive in life. Often resort to drastic action for attention, because their "cause" is not important enough for normal people.
An animal rights activist may be from the groups of
People For The Ethical Treatment of Animals
Animal Liberation Front