a. Someone who anthropomorphizes animals and endows with with human rights.
b. Someone who is self righteous
c. Someone who looks terribly emmaciated, most likely because of malnutrition, but also because of stressing out about animals being eaten and from protesting against carnivorism. These protests are typically caused by the psychological need for attention and/or as a form of rebellion against society.
a. "That cow has the same rights as you or me...."
b. "Um....did you know that the chicken in that sandwich you're eating was stuffed in a cramped cage and not allowed to move? You need to become vegan, or at least vegetarian"
c. "PETA!!!!! ANIMALS ARE PEOPLE TOO!....hang on I have to sit down for a second I think my leg snapped"