While I am not always happy with PETA's campaigns as they can be at times anti-feminist and sexist: if any group has made noise for the animals and has had a lot of effect on people's awareness about the animal holocaust , it's PETA.
One of their very effective campaigns is aimed against Sea-world and other Abusement parks and has been seen by people all over the world.
Huge billboards next to the highway leading to Sea-world advise people NOT to spend money on maintaining animals emprisoned in small tanks, with a horrible and untimely death waiting for them in most cases. All animals have the right to freedom, same as human animals do.
Ingrid Newkirk, the founder of PETA, has opened many people's eyes to the intolerable suffering of animals, and we should praise her and her organisation for this.
Read more about PETA here