Protectora de animales

[ROBINDESBOIS]

How can we say in English Protectoras de Animales?

Animal rights organisation?

[poli]

Your guess is good, but protectors are individuals. A common term in the USA is animal rights activists

[Rusty]

Any organization that protects animals (http://www.upv.es/proanimales/protectoras.htm) would work.

Animal Protection Organizations (or Societies or Services)
Animal Rescues (Groups or Organizations)
Animal Shelters
Animal Welfare Societies (or Associations)

Humane Society
Society for the Prevention of Cruelty to Animals